Fits 1993-2001 Honda Prelude (Base, Type SH, and VTEC) with H22A or F20B engines.

Skunk2 Alpha Series Dual Valve Springs are engineered to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 RPM. These springs are manufactured from high-tensile, super-clean chrome-silicone wire milled in Japan, specifically designed to handle the high-lift and high-revving demands of performance DOHC VTEC builds. By increasing seat and open pressure, these springs ensure the valves follow the camshaft profile accurately, protecting your engine during aggressive driving or competitive racing.

Each component in the Tuner Series line undergoes rigorous testing, including dyno evaluation and real-world testing in drag racing engines reaching up to 11,000 RPM. This set of 16 dual springs provides the reliability and quality required for high-performance H-series and F-series valvetrains.

• Manufacturer Part Number: 311-05-1360
• Spring Type: Dual Springs
• Seat Pressure: 50 lbs at 1.400 in
• Open Pressure: 205 lbs at 0.900 in
• Coil Bind: 0.880 in
• Material: Super-Clean Chrome-Silicone Wire
• Quantity: Set of 16

Fits 1990-2001 Acura Integra (B16A / B17A / B18C). Engineered for high-performance builds, the Skunk2 Alpha Series Dual Valve Spring Set provides the necessary tension to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 RPM.

These dual springs are manufactured from super-clean chrome-silicone wire, a material chosen for its resistance to fatigue and consistent performance under extreme racing conditions. By replacing factory springs with this set, you ensure precise valve control, which is essential when using high-lift camshafts or operating in high-RPM ranges where the OEM valvetrain often reaches its limit.

• Manufacturer Part Number: 311-05-1350
• Quantity: Set of 16 dual springs
• Seat Pressure: 68 lbs at 1.320 in.
• Open Pressure: 210 lbs at 0.820 in.
• Coil Bind: 0.800 in.
• RPM Rating: Supports 10,000+ RPM

Fits select 1986-2000 Acura Integra, Honda Civic, CRX, del Sol, and Wagovan models. Skunk2 Alpha Series Valve Springs are engineered to maintain valvetrain stability and prevent valve float at engine speeds exceeding 10,000 rpm. Developed through years of racing experience, these springs are essential for high-RPM D-series builds where factory components reach their mechanical limits.

Each spring is manufactured from super-clean, chrome-silicone wire milled in Japan. To ensure long-term reliability and performance, Skunk2 subjects their valvetrain components to rigorous testing on both the dynamometer and the track, including high-RPM drag racing and superbike engine environments. These springs provide the necessary tension to ensure the valves follow the cam profile accurately during high-lift and high-speed operation.

• Prevents valve float and maintains stability at 10,000+ RPM
• Manufactured from high-quality Japanese chrome-silicone wire
• Seat Pressure: 62 lbs
• Open Pressure: 158 lbs
• Set of 16 springs
• Manufacturer Part Number: 311-05-1345

Fits select 1992-2000 Honda Civic and Civic del Sol (EX / Si) models with D-Series engines.

Skunk2 Alpha Series valves are engineered for high-performance builds that require superior strength and optimized airflow without changing the stock valve size. Each valve is manufactured from a one-piece forging—using HNV3 martensitic steel for the intake and EV8 austenitic steel for the exhaust—and undergoes a proprietary heat-treatment process for exceptional durability under high-stress conditions. These valves feature hard chrome-plated stems to reduce friction and fully machined heads designed with specific profiles to maximize flow.

By utilizing advanced materials and precise machining, Skunk2 Alpha Series valves are 3-10g lighter than factory components, improving valvetrain stability and response. Whether rebuilding a street engine or a dedicated track car, these components provide the reliability needed for sustained high-RPM use.

• Manufacturer Part Number: 310-05-1600
• Intake Valve: 118.5mm Length, 30.00mm Head, 5.48mm Stem
• Exhaust Valve: 116.0mm Length, 26.00mm Head, 5.45mm Stem
• One-piece forged stainless-steel alloy construction
• Hard chrome plating and fully machined valve heads
• Standard compression stock sizing for direct replacement
• Weight: 3-10g lighter than stock

Fits 1999-2005 Mazda Miata models (1.8L).

Skunk2’s Pro Series 64mm Throttle Body is engineered to maximize engine airflow for increased horsepower and torque gains on the NB Mazda Miata. Designed as a direct bolt-on for the OEM intake manifold, this unit maintains factory drivability while providing the high-flow characteristics required for modified naturally aspirated or forced induction builds. Each unit is CNC-machined from forged 6061-T6 billet aluminum and finished in Skunk2's signature hard-anodized coating for superior wear resistance.

Built for durability and precision, the Pro Series throttle body features sealed bearings for smooth operation and ultra-strong, upgraded shafts to withstand the rigors of performance driving. It remains compatible with the OEM throttle cable to simplify installation. The 64mm bore significantly reduces intake restriction, allowing your engine to breathe more efficiently throughout the entire powerband.

• 64mm large bore for maximum airflow
• CNC-machined forged 6061-T6 billet aluminum construction
• Hard-anodized finish for long-lasting durability
• Sealed bearings and upgraded shafts for smooth, reliable operation
• Direct compatibility with OEM throttle cables and intake manifolds
• Includes new throttle body gasket and all necessary hardware
• US Patent No. D681059S
• Manufacturer Part Number: 309-10-0200

Fits 2017-2020 Honda Civic Type-R (K20C1) and 2018-2020 Honda Accord (2.0L Turbo).

The Skunk2 72mm Electronic Throttle Body is a high-flow replacement designed to increase airflow and throttle response on Honda's K20C turbocharged powerplants. Featuring a significantly larger bore than the factory unit, this throttle body is CNC-machined from 6061-T6 aluminum to ensure precise tolerances and smooth operation. By reducing air intake restriction, it allows for improved volumetric efficiency, especially on vehicles with upgraded intakes, intercoolers, or tuning.

This unit is designed for a direct-fit installation, utilizing the factory mounting points and retaining the original electronic internals for seamless integration with the vehicle's ECU. Whether you are running a stock turbo or a larger aftermarket upgrade, the 72mm bore provides the necessary volume to maximize power across the RPM range.

• Manufacturer Part Number: 309-05-7220
• Bore Diameter: 72mm
• Material: CNC-Machined 6061-T6 Billet Aluminum
• Finish: Clear Anodized for corrosion resistance
• Installation: Direct bolt-on to factory manifold

Fits 2012-2015 Honda Civic Si and 2013-2015 Acura ILX models.

The Skunk2 72mm Electronic Throttle Body is a high-performance upgrade designed to increase airflow and improve throttle response on the K24Z7 engine. By increasing the bore to 72mm, this unit reduces intake restriction, making it a critical modification for vehicles with upgraded intake manifolds, exhaust systems, or forced induction setups. This is a direct-fit replacement that maintains full compatibility with the factory Drive-by-Wire (DBW) system, ensuring precise throttle control without sacrificing drivability.

Each unit is precision-machined from high-quality materials to provide a smooth internal finish and consistent operation. It bolts directly to the factory mounting points and utilizes the factory electronics for a straightforward installation process that requires no wiring modifications.

• 72mm oversized bore for maximum airflow capacity
• Retains factory Drive-by-Wire (DBW) electronic functionality
• Direct-fit, bolt-on replacement for the OE throttle body
• Optimizes engine performance and throttle sensitivity
• Manufacturer Part Number: 309-05-7210

Fits select 1990-2009 Honda and Acura models, including Civic, Integra, Accord, Prelude, and S2000 (B/D/F/H-Series engines).

The Skunk2 Alpha Series 66mm Throttle Body is engineered to maximize airflow for modified engines with increased induction demands. Precision die-cast from high-quality aluminum, this throttle body features a fine shot-blasted surface finish for a clean, OEM-plus appearance. It is a direct bolt-on upgrade compatible with Skunk2 Pro Series Intake Manifolds, as well as factory and other aftermarket manifolds, providing measurable horsepower and torque gains in both naturally aspirated and forced induction applications.

Designed for longevity and smooth operation, the Alpha Series incorporates sealed ball bearings and a precision-machined solid brass throttle plate. Unlike budget alternatives, Skunk2 includes high-end features such as countersunk stainless steel mounting bolts and an integrated idle adjustment screw for precise fine-tuning. This unit retains factory throttle characteristics and is fully compatible with the OEM throttle cable.

• Manufacturer Part Number: 309-05-1030
• Bore Size: 66mm
• Construction: Precision Die-Cast Aluminum
• Finish: Fine Shot-Blasted
• Sealed ball bearings for smooth, reliable operation
• Precision-machined solid brass throttle plate
• Integrated idle adjustment screw
• Compatible with OEM throttle cable
• Includes mounting gasket and hardware

The Skunk2 Pro Series 90mm Billet Throttle Body is engineered for high-performance engines with increased airflow demands. CNC-machined from forged 6061-T6 billet aluminum, this throttle body is designed to be the perfect match for Skunk2 Ultra Series Intake Manifolds. By optimizing induction flow, it provides a bolt-on solution for increased horsepower and torque while maintaining smooth, OEM-like throttle response and drivability.

This unit features a silver hard-anodized finish for superior corrosion resistance and durability. For a cleaner engine bay and cooler operation, Skunk2 relocated the MAP sensor to the underside and eliminated the factory coolant outlets. It utilizes sealed bearings for consistent operation and is compatible with the OEM throttle cable. While it features a Ford Mustang 5.0 bolt pattern, it is designed to use Honda-style MAP and TPS sensors for easy integration.

• Large 90mm bore diameter for maximum airflow capacity
• CNC-forged 6061-T6 billet aluminum construction
• Durable silver hard-anodized finish
• Mustang 5.0 mounting bolt pattern
• Utilizes Honda MAP and TPS sensors
• Sealed bearings for smooth, reliable butterfly movement
• Relocates MAP sensor and deletes water lines for reduced heat transfer
• Compatible with OEM throttle cables
• Integrated Skunk2 badge
• Manufacturer Part Number: 309-05-0900

The Skunk2 Pro Series K2B Throttle Position Sensor (TPS) Adapter allows for the seamless installation of a K-Series TPS onto a B-Series throttle body. This precision-engineered adapter is a vital component for enthusiasts integrating K-Series sensor technology into B-Series intake setups or custom K-swap configurations where throttle response and signal accuracy are paramount.

Featuring a 90mm throttle body opening, this adapter converts the standard B-Series top mount to accept K-Series TPS fitment. It provides a bolt-on solution that avoids the need for complex mounting modifications while ensuring the sensor remains securely positioned for consistent performance.

• Adapts K-Series TPS to B-Series Throttle Body
• 90mm throttle body opening
• Precision machined for a secure, exact fit
• Converts standard B-Series top mount to K-Series fitment
• Manufacturer Part Number: 309-05-0100

Fits select 1986-2001 Honda Accord, Civic, Civic del Sol, CR-V, and Prelude.

Fits select 1990-2009 Acura Integra and Honda Accord, Civic, Civic del Sol, Prelude, and S2000 (D/B/H/F Series).

The Skunk2 Pro Series 68mm Billet Throttle Body is designed to optimize engine airflow for both naturally aspirated and forced induction applications. CNC-machined from forged 6061-T6 billet aluminum, this Black Series unit features a hard-anodized finish for maximum durability. It is specifically engineered to bolt onto Skunk2 Pro Series intake manifolds, but remains compatible with OEM and other aftermarket manifolds for significant horsepower and torque gains across the powerband.

Built to exceed industry standards, this race-only throttle body features sealed bearings for smooth operation and retains OEM throttle characteristics. Skunk2’s unique design relocates the MAP sensor underneath the body and eliminates the factory water passages. This configuration results in a cleaner engine bay and cooler intake temperatures by preventing coolant heat soak. It is compatible with original throttle cables to simplify the installation process.

• Bore Size: 68mm
• Material: CNC-machined forged 6061-T6 billet aluminum
• Finish: Hard-anodized Black Series
• Includes new throttle body gasket and all necessary hardware
• Sealed bearings for high-precision throttle plate movement
• Integrated genuine Skunk2 badge
• Relocated MAP sensor and deleted water passages for performance optimization
• Manufacturer Part Number: 309-05-0045

Fits select 1990-2009 Acura Integra and Honda Accord, Civic, Civic del Sol, Prelude, and S2000 models with B, D, F, and H-series engines.

The Skunk2 Pro Series 68mm Billet Throttle Body is engineered for heavily modified naturally aspirated and forced induction applications where maximizing airflow is critical. CNC machined from forged 6061-T6 billet aluminum and finished in a signature hard-anodized coating, this unit is designed to meet the demands of high-performance racing environments while maintaining smooth drivability. By utilizing Computer Aided Engineering (CAE) during development, Skunk2 has produced a throttle body that exceeds industry standards for flow and durability.

This race-ready component features a unique design that relocates the MAP sensor to the underside and eliminates factory water passages, resulting in a cleaner engine bay and cooler intake temperatures. Sealed bearings ensure consistent, precise throttle plate movement, and the unit is fully compatible with OEM throttle cables for a more straightforward installation on both Skunk2 Pro Series and other aftermarket or OEM intake manifolds.

• Bore Size: 68mm
• Material: Forged 6061-T6 Billet Aluminum
• Finish: Hard Anodized
• Relocated MAP sensor position and deleted water passages
• Sealed bearings for smooth operation
• Includes throttle body gasket and all necessary hardware
• Manufacturer Part Number: 309-05-0040

Fits select 1986-2001 Honda Accord, Civic Si, Civic del Sol VTEC, CR-V, and Prelude models.

The Skunk2 B-Series 90mm Throttle Body Adapter provides B-Series enthusiasts with the flexibility to mount B-Series throttle bodies to the Skunk2 Ultra Race Series intake manifold. CNC-machined from 6061-T6 billet aluminum and finished with hard anodizing for durability, this adapter is designed to handle high-performance applications while maintaining a precise fit.

Each adapter features a 74mm opening and recessed mounting holes to ensure a clean, low-profile installation. This component is specifically engineered for use with Ultra Race Manifolds (PN 307-05-9000 or 307-05-9050), allowing fitment for up to 74mm tabs. All necessary mounting hardware is included for a direct bolt-on installation.

• Material: 6061-T6 Billet Aluminum
• Finish: Hard-Anodized
• Opening Diameter: 74mm
• Adapter Size: 90mm
• Compatibility: For use with Skunk2 Ultra Race Manifolds (307-05-9000 / 307-05-9050)
• Hardware included: Yes
• Manufacturer Part Number: 309-05-0015

Fits 2006-2011 Honda Civic Si (2.0L).

The Skunk2 72mm Electronic Throttle Body (MPN 309-05-0001) is engineered to increase airflow and maximize engine performance on the K-series platform. By increasing the bore diameter to 72mm, this unit reduces intake restriction, allowing for improved throttle response and higher power potential in both naturally aspirated and forced induction setups.

This throttle body is designed as a direct replacement for the factory Drive-by-Wire (DBW) unit, utilizing high-quality internal components to ensure reliable operation and precise throttle control. It is an essential upgrade for enthusiasts installing high-flow intake manifolds or looking to optimize their engine's induction system. Please note that port-matching your intake manifold to the 72mm bore is recommended for maximum efficiency.

• Large 72mm bore design for significantly increased airflow over stock
• Fully compatible with OEM Drive-by-Wire (DBW) electronics and factory harness
• Precision machined for smooth operation and long-term durability
• Direct-fit application for the 8th Generation Honda Civic Si
• Manufacturer Part Number: 309-05-0001

Fits select 1990-2001 Acura Integra, Honda Civic Si, Civic del Sol VTEC, and Prelude models.

The Skunk2 Alpha Series Titanium Retainer Kit is engineered to significantly reduce valvetrain mass, providing the stability required for high-RPM operation and increased horsepower. Manufactured from medical-grade, ultrasonically inspected titanium, these retainers are developed using 3D CAD and Finite Element Analysis (FEA) to ensure an optimized balance of strength and weight reduction. Each retainer features radius-cut edges for improved rocker arm clearance and strategically positioned lightening grooves.

To ensure precise fitment and performance, Skunk2 utilizes CNC machining followed by individual inspections for hole diameter, taper, and surface defects. These tight tolerances ensure proper installed valve spring heights and consistent seat pressures. The reduced overall height also provides better valve seal clearance compared to standard retainers. For quality assurance and material traceability, every retainer is serialized with material batch and production date information.

• Manufacturer Part Number: 308-05-1300
• Material: Medical-grade, certified titanium
• Design: FEA-optimized with radius-cut edges and lightening grooves
• Process: CNC machined and ultrasonically inspected
• Traceability: Individually serialized components
• Function: Replaces heavy OE retainers to reduce valvetrain mass

Fits select 2002-2011 Honda and Acura models (K20/K24/F20C/F22C).

Skunk2 Pro Series Titanium Retainers (MPN: 308-05-0410) are engineered to reduce valvetrain mass, significantly improving stability at high engine speeds. By reducing reciprocating weight, these retainers allow for higher RPM ceilings and better horsepower potential. Unlike standard aftermarket offerings, these retainers feature radius-cut edges for increased rocker arm clearance and strategically placed lightening grooves for maximum weight savings.

The reduced overall height provides additional valve seal clearance, which is critical in high-lift applications. Manufactured from certified, ultrasonically inspected medical-grade titanium, each piece is CNC-machined and individually inspected for proper hole diameter and taper. For quality assurance, every retainer is serialized with material batch specifics and production dates.

• Significant Mass Reduction: 42% lighter than OEM steel retainers.
• Advanced Engineering: Designed using 3D CAD and FEA (Finite Element Analysis) for optimal strength-to-weight ratios.
• Superior Clearance: Radius-cut edges and reduced height for improved rocker arm and valve seal clearance.
• High-RPM Performance: Tested in extreme environments ranging from 11,000 RPM drag engines to 17,000 RPM applications.
• Spring Compatibility: Optimized for use with Skunk2 Tuner Series or Pro Series valve springs.
• Quantity: Set of 16 retainers.

Fits select 2003-2005 Nissan 350Z, Altima, Maxima, and Murano, and Infiniti G35, FX35, and I35 models equipped with the VQ35DE engine.

The Skunk2 Pro Series Intake Plenum Spacer V2.0 is a dyno-proven solution designed to optimize the airflow characteristics of the factory VQ35DE intake manifold. By increasing plenum volume and improving the air path to the front cylinders, this 5/8-inch spacer enhances throttle response and overall engine efficiency. Unlike traditional aluminum spacers, the V2.0 is manufactured from a specialized aerospace thermo-polymer composite, providing a superior thermal barrier that significantly reduces heat soak from the engine block.

This revised V2.0 design features an industry-first injection-sealed perimeter, providing a precision fit that eliminates the need for an OEM gasket. Each kit includes all necessary mounting hardware and the specific components required to bypass the throttle body water lines for maximum intake temperature reduction.

• Manufacturer Part Number: 307-07-0400
• Thickness: 5/8 inch (0.625 in.)
• Material: Aerospace-grade thermo-polymer composite
• Reduces intake air temperatures and improves cylinder filling
• Note: Not compatible with the factory strut tower bar
• Includes all necessary installation hardware

Fits select 1986-2005 Acura and Honda vehicles, including Integra, Civic, CRX, Prelude, and CR-V models equipped with B-Series engine swaps or factory configurations using Skunk2 Ultra Series intake manifolds.

The Skunk2 B-Series Throttle Cable Bracket is engineered specifically for use with Skunk2 Ultra Series Street and Ultra Series Race manifolds. In high-performance and race applications, finding a secure, reliable mounting point for the throttle cable often requires time-consuming custom fabrication. This bracket eliminates that need, providing a bolt-on solution that maintains correct cable geometry and tension for precise throttle response.

• Designed exclusively for Skunk2 Ultra Series Street and Race Manifolds
• Eliminates the need for custom-fabricated throttle brackets
• Ensures proper cable alignment and consistent throttle operation
• Engineered for B-Series engine platforms
• Manufacturer Part Number: 307-05-9560

Fits select 1988-2001 Acura Integra and Honda Civic, Civic del Sol, CR-V, and Prelude.

The Skunk2 Air Temp Blockoff Plate is engineered for B, D, H, and F-series engine builds where the intake air temperature (IAT) sensor is either relocated or no longer utilized. This plate provides a secure, leak-proof solution for sealing the sensor port on Skunk2 Ultra Street and Pro Series intake manifolds. CNC machined from high-grade 6061 aluminum and finished with a durable anodized coating, this component is built to withstand the rigors of high-performance engine bays while resisting corrosion.

• Precision CNC machined from 6061 aluminum
• Anodized finish for long-term corrosion resistance
• O-ring sealed for a reliable, airtight fitment
• Includes all necessary mounting hardware
• Designed specifically for Skunk2 Ultra Street and Pro Series manifolds
• Manufacturer Part Number: 307-05-9555

Fits 1988-2000 Honda Civic, CRX, and Civic del Sol models equipped with D-Series engines.

The Skunk2 Ultra Series Race Intake Manifold represents the next generation of high-performance induction for the Honda D16Z6 and D16Y8. Developed using advanced Computational Fluid Dynamics (CFD) software, this manifold features a three-piece modular design that allows for easy disassembly, custom porting, and plenum volume adjustments. The 3.5L plenum is removable and can be expanded with optional billet spacers to suit specific racing applications.

Designed to outperform the competition, this manifold uses 6.5-inch tilted and tapered high-velocity runners and 81mm raised velocity stacks. The runner walls are generously cast to provide ample material for professional porting, ensuring you can maximize airflow for high-horsepower builds. This kit includes a thermal manifold flange gasket and high-grade mounting hardware for a complete installation.

• Manufacturer Part Number: 307-05-9205
• Plenum Volume: 3.5L
• Finish: Black
• Runner Length: 6.5 in. Tapered/Tilted
• Velocity Stacks: 81mm Raised
• Modular 3-piece design for easy maintenance and porting
• Includes Thermal Manifold Flange Gasket and mounting hardware
• US Patent No. D673977S

Fits 2000-2009 Honda S2000 (Base and CR).

The Skunk2 Ultra Series Race Intake Manifold represents the pinnacle of high-performance intake technology for F20C and F22C engines. Through years of R&D and Computational Fluid Dynamics (CFD) testing, Skunk2 has engineered a three-piece modular manifold that allows for easy disassembly, porting, and plenum volume adjustments. This 3.5L manifold is cast from high-grade 356 aluminum alloy and CNC-machined for a precise fit, making it the ideal solution for high-horsepower naturally aspirated or forced induction builds.

• Modular three-piece design allows for removable plenum and optional spacers
• High-velocity intake runners with smooth transitions and 81mm velocity stacks
• Large 90mm throttle body opening with a Ford 5.0 bolt pattern
• Silver adapter included for a clean, professional installation
• Compatible with 1L and 2L plenum volume upgrades

• Manufacturer Part Number: 307-05-9100
• Material: 356 Aluminum Alloy
• Plenum Volume: 3.5L
• Throttle Body Inlet: 90mm
• Velocity Stacks: 81mm

Fits select 1994-2001 Acura Integra (GS-R, Type R), Honda Civic Si, and Civic del Sol VTEC equipped with B16A, B17A, and B18C engines or VTEC cylinder heads.

The Skunk2 Ultra Series Race Intake Manifold is engineered for high-horsepower builds, utilizing Computational Fluid Dynamics (CFD) to optimize airflow and distribution. This three-piece modular design features a removable plenum, allowing for easy porting and volume adjustments via optional plenum spacers. The manifold is constructed with generously cast runner walls to provide ample material for custom porting, ensuring it can grow with your engine's performance needs.

Each manifold features 6.5-inch tilted and tapered high-velocity runners paired with 87mm raised velocity stacks. The 90mm throttle body flange utilizes the standard 5.0L Ford pattern for broad compatibility with aftermarket throttle bodies. For high-fuel demand applications, the runners include provisions for additional injectors on the underside.

• Manufacturer Part Number: 307-05-9055
• Series: Ultra Series Race (Black Series)
• Plenum Volume: 3.5L (Expandable via optional 1L or 2L spacers)
• Throttle Body Flange: 90mm (5.0L Ford Pattern)
• Velocity Stacks: 87mm Raised
• Runner Length: 6.5-inch Tilted/Tapered
• Construction: Modular 3-piece cast aluminum
• Finish: Black Powder Coated
• Included Hardware: Thermal manifold flange gasket and high-grade mounting hardware
• US Patent No. D673977S

Fits select 1992-2001 Acura Integra GS-R and Type R, Honda Civic Si, and Civic del Sol VTEC models equipped with B-series VTEC engines. The Skunk2 Ultra Series Race Intake Manifold (MPN 307-05-9050) is a three-piece modular design engineered for high-performance applications. Developed using advanced Computational Fluid Dynamics (CFD) software, this manifold optimizes airflow to increase torque and horsepower over a broad powerband compared to standard OE and aftermarket designs.

Constructed with a 3.5L plenum, this manifold features a unique mounting flange that is universally compatible with B16A, B17A, and B18C VTEC cylinder heads. The 6.5-inch tilted and tapered high-velocity runners are cast with generous wall thickness to allow for extensive custom porting, while the raised 87mm velocity stacks ensure a smooth transition into the runners. The plenum is removable, allowing for easy disassembly and the addition of optional 1L or 2L billet aluminum spacers to tune plenum volume to your specific engine requirements.

• 3.5L plenum volume (expandable via optional spacers)
• 90mm throttle body flange using a standard 5.0L Ford pattern
• 6.5-inch tilted/tapered high-velocity runners
• Raised 87mm velocity stacks with ample material for porting
• Provisions for additional injectors on the underside of runners
• High-grade mounting hardware and thermal manifold flange gasket included
• US Patent No. D673977S

Fits 1993-2001 Honda Prelude (Base, Type SH, and VTEC) equipped with H-series engines.

The Skunk2 Pro Series Intake Manifold is engineered to optimize H22-series performance by improving airflow and the venturi effect. Unlike many aftermarket manifolds that use excessively short runners at the expense of mid-range torque, this manifold features specially tapered runners and a larger, tapered plenum. This design preserves usable mid-range power while accelerating airflow to deliver significant top-end gains in both naturally aspirated and turbocharged applications.

Each manifold is shell-molded from high-grade 356-aluminum and CNC-machined for a precise fit and superior strength. The Pro Series manifold eliminates the factory secondary butterflies (IAB) to streamline the intake path and is vacuum-tested to ensure leak-free operation. The runner exits are machined to match the cylinder head ports, maximizing wave scavenging effects across the engine's ideal operating range.

• Manufacturer Part Number: 307-05-0301
• Finish: Black Series
• Material: 356-Aluminum construction
• 70mm throttle body opening (port-matchable up to 74mm)
• Compatible with all factory sensors
• Direct-fit replacement for H-series engines

Fits select 1992-2001 Acura Integra GS-R and Type R, Honda Civic Si, and Civic del Sol VTEC (B16A/B / B17A / B18C).

The Skunk2 Pro Series Intake Manifold is engineered for the street enthusiast seeking significant top-end horsepower and torque gains without sacrificing mid-range performance. This high-flow manifold features a larger plenum and oversized, tapered runners that increase and accelerate airflow while enhancing wave scavenging effects. These design elements ensure a broad increase in usable power, making it ideal for both naturally aspirated and turbocharged applications.

Constructed for durability and precision, these manifolds are shell-molded from 356-aluminum and CNC-machined for a precise fit. The runner exits are machined to match the cylinder head ports, while the 70mm throttle body opening provides a substantial upgrade that can be further port-matched up to 74mm for extreme builds. This Black Series edition features a limited-edition black finish for a stealthy, high-performance look.

• Direct-fit replacement compatible with all factory sensors
• Shell-molded 356-aluminum construction for superior strength
• Oversized plenum and tapered runners for maximum airflow
• 70mm throttle body opening (port-matchable up to 74mm)
• Vacuum-tested for quality and leak-free performance
• Manufacturer Part Number: 307-05-0295

Fits 1990-2001 Acura Integra GS, LS, RS, and Special Edition models equipped with B18A, B18B, or B20 DOHC non-VTEC engines.

The Skunk2 Pro Series Intake Manifold is a performance-engineered upgrade for street enthusiasts looking to increase horsepower and torque without compromising mid-range response. Inspired by the legendary Integra Type R manifold, Skunk2 engineers optimized this design with a larger plenum and oversized, specially tapered runners. These enhancements improve airflow and create an intensified venturi effect, resulting in significant gains across the entire powerband.

Each manifold is shell-molded from high-grade 356-aluminum and CNC-machined for a precise, bolt-on fit to the factory cylinder head. The design is compatible with all OEM sensors and features a 70mm throttle body opening that can be port-matched up to 74mm for higher-flow applications. Vacuum-tested for quality and finished as-cast, this manifold provides an OEM-level fit with professional-grade performance.

• Manufacturer Part Number: 307-05-0280
• Material: Shell-molded 356-aluminum construction
• Finish: As-cast
• Throttle Body Opening: 70mm (port-matchable up to 74mm)
• CARB Exempt: Yes (EO# D-501-1)
• Direct-fit replacement for B-series non-VTEC engines
• Tapered runners and plenum optimized for wave scavenging
• Designed for use with factory sensors and throttle bodies up to 75mm

Note: This unit does not include an intake manifold gasket.

Fits 1994-2001 Acura Integra GS-R (B18C1).

The Skunk2 Pro Series Intake Manifold for the B18C1 engine is engineered to improve airflow and increase power across the mid-range and top-end. Drawing design cues from the Integra Type R manifold, this Pro Series version features a larger internal plenum and oversized, tapered runners to optimize the venturi effect. By eliminating the factory secondary butterflies (IAB system), this manifold simplifies the intake path and increases wave scavenging effects for significant gains in usable horsepower and torque.

• Limited-Edition Black Series finish for superior corrosion resistance and a custom look
• High-grade cast-aluminum construction with precision-machined runner exits to match cylinder head ports
• 70mm throttle body opening, port-matchable up to 74mm
• Compatible with all factory sensors and aftermarket throttle bodies up to 75mm
• Designed specifically for street enthusiasts and racers seeking increased airflow without sacrificing mid-range response
• Manufacturer Part Number: 307-05-0275

Fits 1994-2001 Acura Integra GS-R (B18C1 DOHC VTEC).

The Skunk2 Pro Series Intake Manifold provides a significant performance upgrade for B-series owners looking to maximize airflow without sacrificing mid-range torque. Inspired by the Integra Type R manifold, this Pro Series design features a larger plenum and oversized, tapered runners specifically tuned for the B18C1 engine. By eliminating the restrictive factory secondary butterflies and optimizing the venturi effect, it delivers consistent power gains across the entire RPM range for both naturally aspirated and turbocharged applications.

Constructed from shell-molded 356-aluminum and precision CNC-machined for superior strength, this manifold ensures a precise fit and high-quality finish. The design incorporates wave scavenging effects to broaden the power band and is vacuum-tested to ensure reliability. It serves as a direct-fit replacement and is compatible with all factory sensors and throttle bodies as large as 75mm.

• Direct-fit for 1994-2001 Acura Integra GS-R (B18C1)
• CARB Exempt for street-legal performance
• Shell-molded 356-aluminum construction with "As Cast" finish
• Oversized plenum and tapered runners for increased airflow and scavenging
• Eliminates factory secondary butterflies to streamline intake path
• Compatible with OEM sensors and throttle bodies up to 75mm
• Manufacturer Part Number: 307-05-0270

Fits 2013-2020 Subaru BRZ, Scion FR-S, and Toyota 86.

Skunk2 Alpha Series Connecting Rods are engineered to provide a superior strength-to-weight ratio for high-output FA20 engines. Forged from select 4340 chromoly steel, these H-beam rods are designed to handle in excess of 900 hp. Utilizing Finite Element Analysis (FEA) to identify high-stress points, Skunk2 engineers developed a straight-beam configuration that distributes stress across a larger surface area than traditional tapered designs.

Each rod features a two-piece forging process to ensure optimal grain orientation along the rod cap, providing a precision-tight fit and increased fatigue resistance. To ensure maximum durability under extreme RPMs and high boost, these rods include dual offset oil passages at the pin ends for superior wrist pin lubrication and cooling.

• Material: Forged 4340 Chromoly Steel
• Hardware: 3/8-in ARP2000/Skunk2 Bolts
• Length: 129.39mm
• Weight: 527 Grams (Balanced +/- 1 Gram)
• Small End Bore: 22mm (Width: 21.41)
• Big End Bore: 53mm (Width: 21.41)
• Bushings: Bronze wrist pin bushings
• Testing: Shot-peened and magna-fluxed for structural integrity
• MPN: 306-12-1010

Fits select 1988-2000 Honda Civic, CRX, and Civic del Sol models equipped with D16/Z6 engines.

Skunk2 Alpha Series Connecting Rods are engineered for high-horsepower builds, providing a superior strength-to-weight ratio for the Honda D16 platform. Forged from select 4340 chromoly steel, these rods utilize a straight H-beam design to handle the stresses of forced induction and high-RPM naturally aspirated applications. Each rod undergoes a rigorous manufacturing process, including comprehensive heat-treating, tempering, and shot-peening to reduce fatigue and ensure material consistency. To guarantee structural integrity, every rod is magna-flux inspected and balanced to within +/- 1 gram.

These "Long Rod" variants feature dual-pin oil passages for improved lubrication at the wrist pin, increasing durability under heavy loads. The bronze wrist pin bushings are compatible with most aftermarket pistons without the need for additional machining. Each set includes high-strength 3/8-inch ARP2000/Skunk2 bolts to ensure secure clamping under extreme cylinder pressures.

• Manufacturer Part Number: 306-05-1190
• Material: Forged 4340 Chromoly Steel
• Design: Straight H-beam
• Length: 138.63mm
• Weight: 510 grams (Balanced +/- 1g)
• Hardware: 3/8-in. ARP2000/Skunk2 Bolts
• Power Rating: 900+ HP Capable
• Finish: Shot-peened and Magna-fluxed
• Analysis: FEA Analyzed and Heat Treated