Fits 2008-2015 Subaru WRX and STI models. This Koyo 8mm coolant reservoir adapter is a specialized component required for vehicles equipped with the Koyo performance radiator (Part# VH091662). It ensures a secure, leak-free connection between the radiator and the factory coolant overflow system.

• Precision Fitment: Specifically engineered to integrate with Koyo radiator VH091662.
• Critical Dimension: 8mm fitting designed for the factory reservoir hose diameter.
• Durable Construction: Built to withstand high engine bay temperatures and cooling system pressures.
• Manufacturer Part Number: PI-2182

The Koyorad PI-1186 is a direct-fit replacement radiator drain plug, also known as a petcock, designed to maintain the integrity of your vehicle's cooling system. Over time, plastic drain plugs can become brittle from heat cycles or damaged during routine coolant flushes. This genuine Koyorad component ensures a secure, leak-free seal to prevent coolant loss and overheating.

• Replaces a worn, cross-threaded, or leaking radiator drain plug
• Includes the necessary sealing gasket for a complete installation
• Precision-molded to match original equipment specifications for a reliable fit
• Manufacturer Part Number: PI-1186

Fits 2011-2016 Honda CR-Z (1.5L) models equipped with a manual transmission.

This Koyo replacement radiator is engineered to restore the cooling efficiency of your Honda CR-Z. Designed as a direct-fit component, it bolts to the factory mounting points and utilizes the original fan shroud and hoses for a straightforward installation. Whether you are replacing a cracked tank or a core with compromised cooling fins, this unit ensures your 1.5L hybrid power unit maintains optimal operating temperatures under all driving conditions.

• Direct-fit replacement designed for manual transmission (MT) models
• Precision manufactured to meet or exceed OE specifications
• Integrates with factory mounting points and cooling system hardware
• Durable construction for long-term heat cycle reliability
• Manufacturer Part Number: KS082409

Fits 2012-2015 Honda Civic Si (2.4L).

The Koyorad KH082661 Racing All-Aluminum Radiator is engineered as a high-performance cooling solution for the ninth-generation Civic Si. Designed specifically for manual transmission (MT) models, this radiator replaces the factory unit’s plastic end tanks with fully TIG-welded aluminum construction, providing significantly better durability and resistance to pressure cycles under high heat or track conditions.

This direct-fit radiator utilizes factory mounting points and is compatible with OE fan shrouds for a straightforward installation. It ensures your K24-series engine maintains optimal operating temperatures during spirited driving or competitive use where stock radiators often fail.

• Precision TIG-welded aluminum construction for maximum durability
• Direct-fit design compatible with factory fan shrouds and mounting points
• High-density core optimized for superior heat dissipation
• Polished finish for a professional engine bay appearance
• Manufacturer Part Number: KH082661

Fits 2004-2008 Acura TSX Base (2.4L).

The Koyorad KH081666 Racing Radiator is engineered for manual transmission (MT) 2004-2008 Acura TSX models, providing enhanced thermal management over the factory unit. With a high-efficiency 25mm core, this radiator is designed for drivers who demand consistent cooling performance during spirited driving or track sessions.

Note: This performance radiator is not compatible with the factory OEM radiator cap. Installation requires the use of Koyorad part number SK-C13 or a functionally equivalent aftermarket cap. This unit is specifically designed for manual transmission applications and does not include internal transmission cooling lines.

• Manufacturer Part Number: KH081666
• Core Thickness: 25mm
• Transmission: Manual Transmission (MT) Only
• Compatible with 2004-2008 Acura TSX 2.4L engines
• Requires Koyorad SK-C13 or equivalent radiator cap

Fits 1988-1991 Honda Civic EF chassis models with B-Series engine swaps and manual transmissions.

The Koyo KH080146 all-aluminum radiator is engineered specifically for enthusiasts running a B-Series engine swap in the 1988-1991 Honda Civic (EF) chassis. By replacing the restrictive factory radiator with a high-capacity aluminum core, this unit provides the increased thermal efficiency required for high-performance B16, B17, or B18 powerplants. The all-aluminum construction eliminates the common failure point of brittle plastic end tanks, ensuring reliability under high-stress driving conditions.

• Application: 1988-1991 Honda Civic with B-Series Engine Swap
• Transmission: Manual Transmission (MT) only
• Material: Fully TIG-welded aluminum construction
• Core Design: Optimized fin pitch for maximum airflow and heat dissipation
• Installation: Designed to accommodate the B-Series coolant hose routing in the EF engine bay
• Manufacturer Part Number: KH080146

Fits select 2016-2019 Mazda MX-5 Miata models including Club, Grand Touring, Sport, and RF variants (2.0L I4).

This Koyo aluminum radiator (KH063152) is a precision-engineered cooling upgrade for the ND-generation Mazda MX-5 Miata equipped with a manual transmission. Designed to replace the factory unit, its all-aluminum construction offers improved heat dissipation and durability over standard plastic-tank radiators, making it an essential component for maintaining stable operating temperatures during spirited driving or track sessions. It utilizes original mounting points for a straightforward installation that maintains critical clearances in the engine bay.

• Direct replacement for the factory radiator in 2.0L manual transmission models
• High-grade aluminum construction for superior thermal conductivity
• Precision-welded tanks for increased pressure resistance and longevity
• Retains factory mounting and fan shroud points
• Manufacturer Part Number: KH063152

Fits 2010-2013 Mazda 3 i, S, and Mazdaspeed models (2.3L / 2.5L).

This Koyo replacement radiator is engineered to maintain engine temperatures and restore cooling system efficiency. Designed as a direct-fit component for the second-generation Mazda 3 chassis, it replaces leaking or clogged factory units to prevent overheating and ensure reliable daily operation. Each unit is built to strict tolerances to match the original equipment mounting points and hose connections for a straightforward installation.

• Direct-fit replacement for 2010-2013 Mazda 3 and Mazdaspeed3
• Compatible with 2.3L and 2.5L inline-four engines
• Engineered for optimal heat dissipation and thermal management
• Precision-manufactured to ensure proper coolant flow and pressure resistance
• Manufacturer Part Number: KH062306

Fits 2004-2009 Mazda 3 (i, S, SP23) and 2007-2009 Mazdaspeed 3 (2.3L) models equipped with a manual transmission.

Maintain optimal engine temperatures and protect your powertrain with this Koyo replacement radiator. Designed as a direct-fit solution for the first-generation Mazda 3 platform, this unit replaces a leaking or clogged factory radiator to restore cooling efficiency. Whether you are daily driving a naturally aspirated trim or managing the higher thermal loads of a turbocharged Mazdaspeed 3, this radiator is engineered for a precise fit and reliable service life.

• Direct-fit replacement for manufacturer part number KH061816
• Designed specifically for manual transmission (MT) applications
• Uses factory mounting points and hose connections for a bolt-on installation
• Engineered to meet or exceed original equipment cooling specifications for the 2.3L engine

Fits 2006-2013 Lexus IS250 and IS350 models (2.5L / 3.5L) with manual or automatic transmissions.

This Koyo radiator is engineered as a direct-fit replacement for the factory unit, ensuring your cooling system operates at peak efficiency. Designed to handle the thermal demands of both the 2.5L and 3.5L V6 engines, it restores reliable heat dissipation to protect your engine from overheating during daily driving or spirited use. This unit features precise mounting points for a straightforward installation without the need for modifications.

• Direct-fit OE replacement for 2006-2013 Lexus IS-series models
• Compatible with both 6-speed manual and automatic transmissions
• Specifically engineered for 2.5L and 3.5L V6 engines
• Maintains factory cooling system pressure and flow rates
• Manufacturer Part Number: KH011937

Fits 2005-2011 Lotus Elise and Exige models (1.8L).

This Koyorad Racing all-aluminum radiator (HH652890N) is a performance-grade upgrade designed to eliminate the common failure points of the factory cooling system. In high-performance or track environments, the OE radiator's plastic tanks are prone to cracking or leaking at the crimp seams; this unit replaces that design with a fully TIG-welded, all-aluminum construction for maximum durability and heat dissipation.

• Direct Fit: Designed as a drop-in replacement for the factory unit, utilizing existing mounting points and fan shrouds.
• All-Aluminum Construction: Precision TIG welding and high-grade aluminum provide superior structural integrity over plastic-tank alternatives.
• Racing Efficiency: Optimized core design improves thermal management for the mid-mounted 1.8L engine during spirited driving or track sessions.
• Part Number: HH652890N

Fits 2020-2021 Toyota GR Supra models (3.0L Turbo).

The Koyorad HH423660 Racing All Aluminum Radiator is engineered to meet the high thermal demands of the A90/A91 platform. This direct-fit performance radiator replaces the factory unit with a robust, fully TIG-welded aluminum construction, eliminating the failure points of plastic tanks. Designed for both competitive track use and spirited street driving, it provides superior heat dissipation and increased fluid capacity to maintain stable operating temperatures under high-boost conditions.

• Direct-fit replacement for the OE radiator using factory mounting points and fan shrouds.
• All-aluminum construction with high-density fins for maximum cooling efficiency.
• Fully TIG-welded for exceptional durability and resistance to thermal fatigue.
• Precision-engineered for the 3.0L turbocharged B58 engine.
• Manufacturer Part Number: HH423660

Fits 2001-2006 BMW M3 (3.2L).

The Koyorad HH422675 Racing Series radiator is a high-performance all-aluminum upgrade engineered specifically for the E46 M3. It provides a durable solution to the common failure points of the factory unit, which utilizes plastic end tanks prone to cracking and leaking over time. This radiator is designed for direct fitment using original mounting points, ensuring it integrates seamlessly with the factory fan shroud.

• Manufacturer Part Number: HH422675
• Construction: Fully TIG-welded all-aluminum core and tanks for superior pressure resistance.
• Finish: Polished aluminum.
• Compatibility: Replaces OE radiator for 2001-2006 BMW M3 Base models.
• Design: High-density core optimized for increased heat dissipation during track or spirited driving.

Fits select 1988-2000 BMW 3-Series (E30/E36) and Z3 models equipped with 6-cylinder engines and manual transmissions.

This Koyo radiator provides critical cooling system reliability for BMW's straight-six powerplants. Designed as a direct replacement for the original equipment, it addresses the common heat management needs of the E36 and late E30 chassis. Whether you are maintaining a daily-driven 325i or a track-focused E36 M3, this radiator ensures stable operating temperatures by utilizing high-quality construction and precise fitment points.

• Fits 6-cylinder engines: M20, M50, S50, and S52
• Engineered specifically for Manual Transmission (MT) applications
• Compatible with E30 and E36 chassis configurations
• Replaces worn or leaking factory units to prevent overheating
• Manufacturer Part Number: HH422674

Fits 2023-2024 Honda Civic Type R (FL5).

Optimize your FL5's thermal management with the Koyo All Aluminum Radiator (HH083967). Engineered specifically for the 11th Gen Civic Type R, this high-performance radiator addresses the heat soak issues common during track sessions and spirited driving. The all-aluminum construction features precision TIG welding and eliminates the potential failure points of factory plastic-tank units, providing a significant upgrade in both durability and cooling capacity.

• Direct-fit replacement for the factory radiator using OEM mounting points
• Fully brazed aluminum core for maximum heat dissipation efficiency
• TIG-welded tanks for superior strength under high pressure
• Compatible with factory fan shrouds, hoses, and sensors
• Manufacturer Part Number: HH083967

Fits 2022-2023 Honda Civic 1.5L Turbo (MT and CVT) and 2023 Acura Integra (1.5L).

The Koyo HH083833 All Aluminum Radiator is a high-performance cooling upgrade designed to replace the plastic-tank factory unit. This all-aluminum construction provides superior heat dissipation and eliminates the risk of cracked end tanks under high pressure or extreme temperatures. Engineered for a precision drop-in fit, it utilizes the factory mounting points and is fully compatible with both manual and CVT transmission configurations.

• Direct-fit design for seamless installation with OE fan shrouds and hoses
• Precision TIG-welded all-aluminum construction for enhanced durability
• High-density core improves thermal efficiency for the 1.5L Turbo engine
• Designed for both Manual Transmission (MT) and CVT models
• Manufacturer Part Number: HH083833

Fits 2017 Honda Civic Type-R (2.0L Turbo).

The Koyorad HH083417 Racing All Aluminum Radiator is a high-performance cooling upgrade designed to withstand the thermal demands of track and spirit driving. Unlike the factory radiator which utilizes plastic tanks prone to cracking under high pressure, this Koyorad unit features 100% brazed aluminum construction and precision TIG-welded tanks for maximum durability. The high-efficiency core provides superior heat dissipation and increased fluid capacity, ensuring your engine maintains consistent operating temperatures under load.

• All-aluminum construction with a brazed core for optimal heat transfer
• Precision TIG-welded tanks replace failure-prone factory plastic components
• Designed to mount directly to factory positions for a straightforward installation
• Engineered for high-performance and racing applications
• Manufacturer Part Number: HH083417

Fits 1994-2000 Honda Civic and Civic del Sol (1.6L).

This Koyo manual transmission (MT) radiator is designed to maintain optimal operating temperatures for your 1.6L Honda engine. Engineered with precise 32mm inlet and outlet pipes, the HH080300 ensures efficient coolant flow and a secure fit to the factory cooling system. Whether replacing a leaking OE core or upgrading for better thermal management, this unit provides the reliability expected from a premier cooling specialist.

• Designed specifically for manual transmission (MT) configurations
• Inlet/Outlet Pipe Diameter: 32mm
• Direct fitment using factory mounting points and fan shrouds
• Engineered for 1.6L Honda B and D-series engines
• Manufacturer Part Number: HH080300

Vehicle Compatibility:

• 1999-2000 Honda Civic (CX, DX, EX, GX, HX, LX, Si)
• 1999 Honda Civic (Value Package)
• 1994-1997 Honda Civic del Sol (S, Si, VTEC)

Fits select 1992-2000 Honda Civic and 1993-1997 Honda Civic del Sol models equipped with manual transmissions and 28mm hoses.

This Koyo replacement radiator provides a precision-engineered cooling solution for enthusiasts and daily drivers alike. Designed specifically for manual transmission (MT) applications, this unit features the correct 28mm inlet and outlet hose diameters required for a secure, leak-free connection to your existing cooling system. Whether you are maintaining a daily commuter or refreshing an EJ or EG chassis for spirited driving, this radiator ensures reliable thermal management by adhering to tight manufacturing tolerances and high-grade construction standards.

• Direct fit for manual transmission models
• Specifically designed for 28mm radiator hoses
• Precision construction ensures reliable heat dissipation
• Compatible with factory mounting points and fan shrouds
• Manufacturer Part Number: HH080292

Fits 1983-1985 Mazda RX-7 (1.3L) with manual transmission, including GS, GSL, GSL-SE, S, and Limited Edition trims.

Keep your rotary engine running cool with this high-performance radiator from Koyo. Specifically engineered for the Mazda FB chassis, this radiator is a direct replacement for manual transmission models. It features precision-engineered tanks and a core design optimized for the unique thermal requirements of the 13B and 12A rotary powerplants.

• Manufacturer Part Number: HH063146
• Compatible Chassis: 1983-1985 Mazda RX-7 (FB)
• Transmission Type: Manual Transmission (MT) only
• Coolant Sensor Port: Includes M12 x 1.25 provision for low coolant sensor (top tank center)
• Note: Does not include emissions switch provision on the driver's side bottom tank

Fits 2009-2011 Mazda RX-8 Grand Touring, R3, Sport, and Touring models with the 1.3L engine and manual transmission.

The Koyo HH062267 Racing All Aluminum Radiator is a performance cooling solution designed to replace the failure-prone factory radiator. Engineered for the high heat cycles of the 1.3L Renesis rotary engine, this radiator features a fully TIG-welded aluminum construction, eliminating the plastic tanks and crimped seams found in OE units. Its high-density core increases fluid capacity and heat dissipation surface area, making it an essential upgrade for both street-driven and track-focused RX-8s.

• Manufacturer Part Number: HH062267
• Full all-aluminum construction with hand-welded tanks
• Direct bolt-on replacement for factory mounting points
• Optimized for manual transmission (MT) configurations
• High-polish finish for improved engine bay aesthetics

Fits 1993-1995 Mazda RX-7 Base, R1, R2, and Touring models (1.3L).

The Koyo HH060644N N-FLO Dual Pass radiator is engineered specifically for the high thermal demands of the FD-generation RX-7. Featuring Koyo's advanced N-FLO design, this radiator utilizes internal partitions to force coolant through the core twice, significantly increasing heat dissipation compared to conventional single-pass units. This improved thermal efficiency is vital for protecting the 1.3L 13B-REW turbocharged rotary engine from overheating during high-load operations or track use.

• N-FLO Dual Pass configuration maximizes cooling efficiency and thermal exchange
• Precision construction designed for a direct-fit replacement of the factory unit
• Optimized core design for the FD3S chassis and 1.3L turbo powertrain
• Manufacturer Part Number: HH060644N

Keep your FD chassis cool under pressure with the Koyorad Racing Series all-aluminum radiator. Engineered as a high-performance upgrade for the 1993-1995 Mazda RX-7, this unit (MPN HH060644) replaces the prone-to-failure factory plastic-tank radiator with a robust, TIG-welded aluminum construction. It is designed to handle the intense thermal demands of the 1.3L rotary engine, providing increased cooling capacity and superior heat dissipation for both spirited street driving and competitive track use.

• Fully TIG-welded aluminum construction for maximum durability and pressure resistance
• High-density core designed specifically for the RX-7's compact engine bay
• Retains factory mounting points and is compatible with OE fan shrouds
• Polished finish for a professional engine bay appearance
• Manufacturer Part Number: HH060644

Fitment: Fits 1993-1995 Mazda RX-7 Base, R1, R2, and Touring models with the 1.3L engine.

Fits 1989-1991 Mazda RX-7 (1.3L) manual transmission models.

This Koyorad N-FLO Technology radiator is designed for performance-driven cooling in the FC chassis. Featuring a dual-pass internal flow design, it maximizes heat dissipation by ensuring coolant travels through the core twice for increased thermal efficiency over standard single-pass units. Constructed from high-quality aluminum, it is an essential upgrade for both naturally aspirated and turbocharged 13B rotary engines.

• N-FLO dual-pass technology for superior temperature control
• Direct fitment for manual transmission (MT) applications only
• Engineered for the 1.3L rotary engine (FC3S chassis)
• Manufacturer Part Number: HH060643N

Installation Note: This performance radiator is not compatible with the OEM intake snorkel. Installation requires minor trimming of the factory fan shroud for proper clearance.

Fits 1989-1991 Mazda RX-7 (1.3L) Late FC chassis models, including Base, Convertible, GTU, GTUs, GXL, and Turbo variants.

This Koyo high-performance aluminum radiator is engineered to provide superior thermal management for the second-generation RX-7. Featuring an increased core thickness compared to the factory unit, this radiator provides the additional cooling capacity necessary for both spirited street driving and track applications. This unit is designed exclusively for manual transmission vehicles and retains compatibility with both turbocharged and naturally aspirated Late FC platforms.

• Manufacturer Part Number: HH060643
• Transmission: Manual Transmission (MT) only
• Compatibility: Fits 1989-1991 (Series 5) Turbo and Non-Turbo models
• Mounting: Requires the reuse of Series 4 or Series 5 specific OEM side brackets
• Installation Note: The increased thickness of this performance core may require minor modifications for clearance with the factory intake snorkel

Fits 1986-1988 Mazda RX-7 (FC) NA and Turbo models equipped with manual transmissions.

This Koyo radiator is engineered as a precision-fit cooling solution for the second-generation Mazda RX-7. Designed to replace the factory unit, it provides the thermal efficiency required for the 1.3L rotary engine, which naturally generates significant heat. Whether you are maintaining a naturally aspirated GXL or a turbocharged model, this radiator ensures consistent operating temperatures during daily driving or spirited performance use.

• Direct replacement for 1986-1988 FC Mazda RX-7 chassis
• Compatible with both Naturally Aspirated (NA) and Turbo rotary engines
• Specifically designed for Manual Transmission (MT) applications only
• Utilizes factory mounting points for a straightforward installation
• Manufacturer Part Number: HH060642

Designed for dedicated track builds and forced induction setups, the Koyo HH032412 Half-Size RACE Radiator provides a compact cooling solution for 2003-2006 Mitsubishi Lancer and Evolution models equipped with manual transmissions. By utilizing a half-size footprint, this radiator frees up critical engine bay space, allowing for the installation of large aftermarket turbochargers and custom exhaust manifolds without sacrificing thermal efficiency.

Constructed with Koyo’s signature precision, this all-aluminum radiator replaces the bulky factory unit while maintaining the high-pressure tolerances required for racing environments. It is an essential upgrade for Evo 7, 8, and 9 owners looking to optimize airflow and engine bay packaging for high-performance applications.

• Manufacturer Part Number: HH032412
• Design: Half-size race configuration to clear large turbo setups
• Transmission: Manual Transmission (MT) only
• Material: High-grade aluminum construction for superior heat dissipation
• Fitment: Bolts directly to factory locations on select Mitsubishi chassis

Vehicle Fitment:
Fits 2003-2006 Mitsubishi Lancer (ES, Evolution, MR, RS, SE, LS, OZ Rally, Ralliart, Sportback).

Fits 2003-2006 Mitsubishi Lancer, Evolution VIII/IX, Ralliart, and Sportback models (2.0L).

Maintain optimal engine temperatures with this Koyo replacement radiator. Designed as a direct-fit solution for manual transmission vehicles, this radiator replaces worn or leaking factory units to ensure reliable cooling performance during daily driving or high-stress conditions. Koyo’s precision engineering guarantees that all factory mounting points and hose connections align for a straightforward installation.

• Engineered specifically for 2.0L manual transmission (MT) applications
• Direct-fit replacement for the original equipment radiator
• Maintains factory-spec cooling efficiency and fitment tolerances
• Constructed to handle the thermal demands of the Mitsubishi 4G63 and 4G94 engine platforms
• Manufacturer Part Number: HH031610

Fits 1997-2000 Mitsubishi Evolution IV, V, and VI (Turbo models with Manual Transmission).

The KoyoRad HH030939 performance radiator is a high-efficiency cooling upgrade designed for the CP9A and CN9A chassis. Built to handle the increased thermal loads of turbocharged 4G63 engines, this aluminum radiator provides significantly better heat dissipation than the factory unit. Note: This specific radiator is engineered to be used exclusively with 2003-2007 Evolution (Evo 7/8/9) fan shrouds to ensure proper fitment and maximum airflow across the core.

• High-performance aluminum core for improved thermal management
• Precision TIG-welded tanks and fully polished finish
• Designed specifically for manual transmission (MT) Turbo models
• Compatible with 03-07 Evolution fan shroud assemblies
• Manufacturer Part Number: HH030939

Fits 1968-1972 Nissan Skyline (C10 Chassis) equipped with the L20 I6 engine and manual transmission. This Koyorad performance radiator (HH023610) provides an essential cooling system upgrade for classic KGC10 models, engineered to maintain optimal operating temperatures under demanding conditions.

Designed as a high-performance replacement, this unit features a revised filler neck to accommodate modern radiator caps. Please note that the original OEM cap is not compatible; a Koyorad SK-C13 or equivalent style cap is required for installation.

• Engineered specifically for L20 I6 models with manual transmissions
• Revised filler neck allows use of modern, high-pressure SK-C13 style caps
• Precision-fit for the C10 Skyline chassis
• Does not fit GT-R trim models
• Manufacturer Part Number: HH023610