The Borla Pro-XS 40344 muffler is a high-performance universal component designed for custom exhaust systems where flow efficiency and sound control are paramount. Featuring a straight-through, free-flow internal design, it minimizes backpressure to optimize engine output. The reversible center/offset configuration provides maximum installation flexibility for various chassis layouts.

Built for longevity, the Pro-XS series is manufactured from premium T-304 austenitic stainless steel to prevent corrosion and oxidation. The 100% welded construction provides the structural integrity needed for high-vibration environments. For acoustic management, Borla uses high-temperature continuous-filament fiber (CFF) packing to deliver a deep, sporty tone without the rasp often found in lesser mufflers.

• Inlet/Outlet Diameter: 2.00 in.
• Case Dimensions: 14.00 in. L x 4.00 in. H x 9.50 in. W
• Configuration: Center / Offset (Reversible)
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Polishable)
• Construction: 100% Welded
• Acoustic Material: Continuous-Filament Fiber (CFF)
• Manufacturer Part Number: 40344

The Borla S-Type Specialty Muffler (401664) is a universal, reversible performance muffler engineered for truck and SUV applications that require a long-body design for superior sound control. This muffler provides the signature S-Type exhaust note, offering a deep, aggressive tone while maintaining a high-flow internal architecture for improved performance.

Built for durability, this muffler is constructed from 100% welded T-304 austenitic stainless steel to prevent corrosion. The un-notched necks are specifically designed for a secure weld-in installation. Internally, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material to manage sound levels and prevent packing blowout over time.

• Part Type: Specialty Muffler
• Inlet/Outlet: 2.75-inch Center In / Center Out
• End Type: Un-Notched (Weld-in)
• Case Dimensions: 6.75-inch Diameter x 24-inch Body Length
• Overall Length (OAL): 29 inches
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Brushed or Polished)
• Design: Reversible for installation flexibility
• MPN: 401664

The natural mill finish can be brushed or polished prior to installation. This unit is backed by Borla's Million-Mile warranty.

This universal reversible muffler is designed for truck and SUV applications requiring a long-body configuration for refined "Touring" sound levels.

The Borla Specialty Touring muffler is engineered for drivers who want a more moderate exhaust note without sacrificing performance. Constructed from high-quality T-304 austenitic stainless steel, this 100% welded unit is built to resist rust and withstand high temperatures. Its free-flow internal design minimizes backpressure, while the high-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound control throughout the life of the muffler. The un-notched necks are specifically designed for a secure weld-in installation, and the reversible case offers maximum flexibility for custom exhaust routing.

• Manufacturer Part Number: 401663
• Inlet/Outlet: 3.00-inch Center In / 3.00-inch Center Out
• Configuration: Un-notched necks (Weld-in)
• Body Dimensions: 7.75-inch Diameter x 24.00-inch Length
• Overall Length: 29.00 inches
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Can be brushed or polished)
• Warranty: Million-Mile Limited Warranty

The Borla 401662 Specialty Touring muffler is engineered for truck and SUV applications where a longer body is required to achieve a refined, controlled exhaust note. This universal-fit muffler features a reversible design for installation flexibility and a high-flow internal architecture that minimizes backpressure while managing sound levels using high-temperature continuous-filament fiber (CFF) acoustic material.

• Material: Constructed from premium T-304 austenitic stainless steel for maximum corrosion resistance and durability.
• Construction: 100% welded seams for structural integrity under high-heat conditions.
• Finish: Natural mill finish that can be brushed or polished to your preference.
• Installation: Features notched necks specifically designed for 1-inch wide band-style clamps (Borla 18330, sold separately). For an un-notched version, see part 401663.
• Dimensions: 3-inch center inlet and outlet, 7.75-inch diameter round body, 24-inch body length, and 29-inch overall length (OAL).
• Warranty: Backed by the Borla Million-Mile warranty.

Proudly made in the USA, this Touring series muffler provides a deeper, throatier tone compared to smaller diameter units without the aggressive volume of a race-spec component.

The Borla XR-1 Racing Sportsman muffler (401392) is engineered for high-performance racing applications where space is at a premium. Featuring a 2.5-inch center inlet and center outlet, this 5-inch round muffler uses a high-flow, straight-through design to maximize exhaust scavenging and power output. The reversible internal configuration provides additional flexibility for custom exhaust routing.

• Durable Construction: Built from T-304 austenitic stainless steel with 100% welded seams for superior strength and corrosion resistance in extreme racing conditions.
• Advanced Sound Control: Packed with high-temperature continuous-filament fiber (CFF) acoustic material to manage sound levels without sacrificing flow.
• Installation: Features un-notched necks designed for weld-in installation. For clamp-on applications, use a 3-inch wide band clamp (Borla 18004).
• Finish: Supplied in a natural mill finish that can be brushed or polished to your preference.

• Inlet/Outlet Diameter: 2.5in
• Case Shape: 5in Round
• Body Length: 15in
• Overall Length: 20in
• Material: T-304 Stainless Steel
• Manufacturer Part Number: 401392

The Borla XR-1 Multi-Core Racing Muffler (MPN: 401384) is engineered for high-horsepower applications where maximum exhaust flow and space efficiency are critical. Featuring Borla's patented Multi-Core three-tube internal design, this muffler is proven to flow better than a straight piece of tubing while providing essential sound attenuation for track or high-performance street use.

Constructed from premium T-304 stainless steel with 100% welded seams, this 4-inch round muffler is designed to withstand extreme temperatures and resist corrosion. Its compact footprint makes it an ideal solution for custom builds or any vehicle with limited underbody clearance. The natural mill finish offers a clean look out of the box and can be brushed or polished to match your build's requirements. High-temperature continuous-filament fiber (CRF) acoustic material ensures long-lasting sound control without degrading over time.

• Manufacturer Part Number: 401384
• Inlet/Outlet: 2.5" Center / 2.5" Center
• Body Dimensions: 4" Round x 12" Long
• Overall Length: 17"
• Material: T-304 Stainless Steel
• Internal Design: Patented Multi-Core 3-Tube
• Construction: 100% Welded with CRF Packing
• Installation: Reversible design for maximum mounting flexibility

The Borla XR-1 Multi-Core Racing Muffler (401382) is engineered for high-horsepower competition and street applications where chassis clearance is limited. Often referred to as a "Hot Rod" muffler, its compact 4-inch round body houses Borla’s patented Multi-Core three-tube internal design. This configuration is tested to flow better than straight tubing, ensuring maximum exhaust velocity, horsepower, and torque for demanding builds.

Constructed from 100% welded T-304 stainless steel, this muffler is built to resist corrosion and withstand the extreme heat of racing environments. The interior features high-temperature continuous-filament fiber (CRF) acoustic material for consistent sound control without the packing blowout common in lesser units. The natural mill finish can be left as-is, brushed, or polished to a mirror finish before installation.

• Inlet/Outlet: 2.5" Center / 2.5" Center
• Body Dimensions: 4" Round x 16" Body Length
• Overall Length (OAL): 21"
• Material: T-304 Stainless Steel
• Design: Patented Multi-Core 3-Tube internal structure
• Installation: Fully reversible design for mounting flexibility
• Origin: Made in the USA
• Manufacturer Part Number: 401382

The Borla 401343 universal resonator is engineered for high-performance exhaust systems where space is at a premium. Built with a straight-through design, this resonator minimizes drone and optimizes sound quality without restricting exhaust flow. Its compact 5-inch round by 10-inch body makes it an ideal choice for custom fabrications or tight underbody clearances.

• Construction: 100% welded T-304 stainless steel for maximum durability and corrosion resistance.
• Performance Design: Features a straight-through core for unrestricted flow and continuous-filament fiber (CFF) acoustic material for precise sound control.
• Installation: Equipped with notched inlet and outlet necks designed for easy clamp-on installation using 1-inch wide band-style clamps (e.g., Borla 18330).
• Versatility: Reversible design allows for flexible mounting configurations; mill finish can be brushed or polished to suit your build.
• Specifications: 3-inch center inlet/outlet, 5-inch round diameter, 10-inch body length.
• Quality Assurance: Made in the USA and backed by the Borla Million-Mile Warranty.

Note: For weld-in applications, see alternate part number 401339. For clamp-on installation, Borla recommends 1-inch wide band clamps (part 18330) or 3-inch wide band clamps (part 18006) depending on your specific setup.

The Borla 401339 Universal Resonator is engineered for custom exhaust builds where space is limited and sound control is a priority. Designed for a universal fit, this resonator utilizes a straight-through performance core to minimize rasp and exhaust drone without creating restrictive backpressure. The compact 5-inch round body and 10-inch length make it an ideal choice for vehicles with tight undercarriage clearances.

Built for long-term durability, the resonator is constructed from premium T-304 stainless steel and features a natural mill finish that can be brushed or polished. For internal sound suppression, Borla uses continuous-filament fiber (CFF) acoustic material, which provides consistent tone control and resists blowout over time. The un-notched necks are optimized for a secure weld-in installation, but can also be secured using 3-inch wide band clamps (part number 18006, sold separately).

• Manufacturer Part Number: 401339
• Configuration: 3-inch Center Inlet / 3-inch Center Outlet
• Dimensions: 5-inch Round Case, 10-inch Body Length
• Material: T-304 Stainless Steel
• Internal Design: Straight-Through Core with CFF Acoustic Material
• Installation: Reversible design; Un-notched necks for weld-in or clamp-on
• Warranty: Borla Million-Mile Warranty
• Origin: Made in the USA

This Borla universal resonator (MPN 401338) provides effective sound control in a compact package designed for applications with limited space. Featuring a high-flow, straight-through performance design, it utilizes continuous-filament fiber (CFF) acoustic material to manage exhaust notes without sacrificing flow. The 5-inch round body and reversible design allow for flexible installation in various custom exhaust configurations.

Built from premium T-304 stainless steel with 100% welded construction, this resonator is engineered for maximum durability and corrosion resistance. The un-notched necks are specifically designed for weld-in installation. If clamping is required, Borla recommends using 3-inch wide band clamps (part number 18005, sold separately). For an alternative with notched necks, refer to part number 401342.

• Inlet/Outlet: 2.75-inch (Center/Center)
• Dimensions: 5-inch Round Body, 10-inch Length
• Material: T-304 Stainless Steel
• Construction: 100% Welded, Straight-Through Performance Design
• Acoustic Packing: Continuous-Filament Fiber (CFF)
• Finish: Natural Mill Finish (Brushable/Polishable)
• Installation: Weld-In (Un-notched); Reversible
• Manufacturing: Made in the USA
• Warranty: Million Mile Warranty

The Borla 401158 is a heavy-duty universal muffler engineered specifically for truck applications where durability and flow are paramount. Classified within the Borla "Touring" sound range, this unit provides a more refined exhaust note compared to more aggressive options like the 400130. It features a reversible internal design, providing maximum flexibility during custom exhaust routing.

• Construction: 100% welded T-304 stainless steel for lifetime corrosion resistance.
• Internal Design: Straight-through free-flow configuration with high-temperature continuous-filament fiber (CFF) acoustic material for consistent sound control.
• Inlet/Outlet: 2.75-inch diameter notched necks for secure clamp-on installation.
• Dimensions: 7.75-inch diameter body with a 24-inch overall length.
• Finish: Natural mill finish (suitable for brushing or polishing).
• Interchange: Directly replaces previous part number 19131346.
• Manufacturer Part Number: 401158

Fits select 2008-2017 Chevrolet Camaro SS, Corvette, and SS (6.2L).

The Borla CrateMuffler is the industry's first muffler specifically engineered to optimize the acoustic profile and power delivery of the Chevrolet LS3 6.2L V8 engine family. This ATAK series muffler provides an aggressive exhaust note while utilizing Borla’s patented Polyphonic Harmonizer Technology. This system uses internal units with varying pipe diameters and lengths to create multiple notes that harmonize into a clean, full-bodied sound while significantly reducing or eliminating cabin drone.

Constructed from premium T-304 stainless steel, this muffler offers superior corrosion resistance and durability compared to standard T-400 series materials. The directional design is precision CNC-manufactured for an accurate fit, featuring a 3-inch offset inlet and a 3-inch center outlet identifiable by the welded mounting bracket on the endcap.

• Manufacturer Part Number: 400958
• Series: CrateMuffler ATAK (Aggressive Sound)
• Material: T-304 Stainless Steel
• Inlet/Outlet: 3" Offset Inlet / 3" Center Outlet
• Case Dimensions: 14" x 4.35" x 9.10" Oval
• Overall Length: 19"
• Warranty: Million-Mile Warranty

Fits select 2008-2017 Chevrolet Camaro SS, Corvette, and SS models (6.2L).

The Borla CrateMuffler is the world's first exhaust solution purpose-built to optimize the acoustics and performance of crate engines and custom builds. This specific model is precision-tuned for the Chevrolet LS3 6.2L V8 engine family, utilizing a directional S-Type internal design that delivers an aggressive exhaust note while significantly reducing or eliminating cabin drone.

Constructed from premium T-304 stainless steel, this muffler offers superior durability and corrosion resistance compared to standard T-400 series materials. The directional flow design is easily identified by the mounting bracket welded to the outlet endcap, ensuring a correct install every time.

• Engine Specific: Acoustic tuning optimized for the 6.2L LS3 V8 engine.
• Premium Materials: High-quality T-304 stainless steel construction for longevity.
• Flow Configuration: 3-inch offset inlet and 3-inch center outlet.
• Dimensions: 14-inch body length, 19-inch overall length, with a 6-inch x 10.34-inch oval profile.
• Customizable Sound: Compatible with Borla resonator 400939 to achieve a more mellow Touring sound profile.
• Manufacturing: CNC-manufactured for precise fitment and backed by a Million-Mile Warranty.

Fits select 2008-2016 Chevrolet Camaro (SS/ZL1), Corvette (Base/Grand Sport/ZR1), Chevrolet SS, and Pontiac G8 GXP with LS3 engine platforms. Borla CrateMuffler is the industry's first exhaust solution specifically engineered to optimize the power delivery and acoustic signature of crate motors and custom builds.

This CrateMuffler (MPN 400947) features the aggressive ATAK sound level, providing a high-clarity, high-volume exhaust note without the interior drone common in generic mufflers. Each unit is tuned for the specific harmonics of the LS3 engine family. The muffler utilizes a directional flow design, which can be identified by the mounting bracket welded to the outlet endcap. Constructed from premium T-304 stainless steel, it offers superior corrosion resistance over standard 400-series or aluminized steel.

• Part Number: 400947
• Series: CrateMuffler ATAK
• Engine Application: LS3
• Inlet/Outlet Diameter: 2.5in
• Configuration: Offset / Offset
• Case Dimensions: 14in x 4.35in x 9in
• Material: T-304 Stainless Steel
• Manufacturing: Precision CNC manufacturing
• Warranty: Borla Million-Mile Warranty

Fits select 2008-2016 Chevrolet Camaro (SS/ZL1), Corvette, SS, and Pontiac G8 GXP models equipped with LS3 engine families.

The Borla CrateMuffler (MPN 400946) is a purpose-built exhaust solution engineered specifically to optimize the acoustic profile and power delivery of LS3 crate and custom-built motors. As part of the S-Type series, this muffler delivers a deep, aggressive tone without the intrusive drone typically found in universal mufflers. For those seeking a quieter "Touring" sound level, this muffler can be paired with Borla resonator 400938.

Constructed from premium T-304 stainless steel, this muffler offers superior corrosion resistance and durability compared to standard 400-series stainless steel. The precision CNC-manufactured housing features a directional design for maximum flow efficiency; the outlet side is easily identified by the mounting bracket welded to the endcap.

• Series: CrateMuffler S-Type
• Configuration: 2.50in Offset Inlet / 2.50in Offset Outlet
• Case Dimensions: 14in L x 4.35in H x 9in W Oval
• Material: T-304 Stainless Steel
• Manufacturing: CNC Numerical Control
• Part Number: 400946
• Warranty: Million-Mile Warranty

Fits select 2008-2016 Chevrolet Camaro, Corvette, SS, and Pontiac G8 models.

The Borla CrateMuffler is the industry's first exhaust solution specifically engineered to optimize the acoustic profile and power delivery of crate and custom-built engines. This ATAK series muffler provides Borla's most aggressive sound level, meticulously tuned for the LS3 engine family to eliminate cabin drone while delivering a high-performance exhaust note. Unlike universal mufflers, these units feature a directional flow design; the outlet end is easily identified by the mounting bracket welded to the endcap.

Constructed from premium T-304 stainless steel, this muffler offers superior corrosion resistance and longevity compared to 400-series alternatives. Each unit is manufactured using precision CNC technology to ensure exact fitment and is backed by Borla's Million-Mile Warranty.

• Part Number: 400945
• Sound Level: ATAK (Aggressive)
• Configuration: 2.25in Offset Inlet / 2.25in Offset Outlet
• Case Dimensions: 14in x 4.35in x 9in (Oval)
• Material: T-304 Stainless Steel
• Construction: Precision CNC manufactured
• Design: Directional flow with integrated outlet mounting bracket

Designed for universal 3-inch exhaust systems and custom applications, the Borla CrateMuffler Resonator (MPN: 400939) offers precise sound tuning without sacrificing flow. This compact, reversible bottle-style resonator is engineered to attenuate overall sound pressure levels (SPL) by approximately 2-3 dB(A). It is the ideal solution for users wanting to transition a Borla S-Type CrateMuffler setup to a more subtle Touring sound level, or for any high-performance build where space is at a premium.

Built from high-grade T-304 austenitic stainless steel, this resonator features a straight-through design that maintains maximum exhaust velocity. The 100% welded construction ensures structural integrity, while the high-temperature continuous-filament fiber (CFF) acoustic material provides long-lasting sound control. The natural mill finish allows for custom brushing or polishing to match your vehicle's underside.

• Inlet/Outlet: 3" Center Inlet / 3" Center Outlet (Un-notched necks)
• Dimensions: 4" Round diameter, 10" body length, 15" overall length
• Materials: T-304 austenitic stainless steel with CFF internal packing
• Installation: Weld-in design (can be clamped using 3" wide band clamps, Borla part 18006)
• Design: Reversible, straight-through performance design with no logo embossment
• Warranty: Backed by Borla's Million-Mile warranty

The Borla CrateMuffler Resonator (MPN 400938) is engineered for applications with limited space where sound pressure level (SPL) reduction is required. This compact, reversible resonator attenuates overall sound by approximately 2-3 dB(A), making it the perfect addition to a Borla S-Type CrateMuffler system to achieve a more refined "Touring" sound profile. Its straight-through design ensures that exhaust gas velocity and performance are never compromised.

• Material Excellence: Manufactured from high-quality T-304 austenitic stainless steel with 100% welded construction for maximum strength and rust resistance.
• Acoustic Control: Features high-temperature continuous-filament fiber (CFF) acoustic material for consistent sound management.
• Specifications: 2.5" center inlet and outlet; 4" round body with a 10" body length and 15" overall length.
• Installation: Features un-notched necks for a secure weld-in installation. For clamp-on applications, use 3" wide band clamps (Borla 18004).
• Versatile Design: Reversible configuration for flexible installation; the natural mill finish can be brushed or polished to preference.

Made in the USA and backed by the Borla Million-Mile warranty, this resonator is a durable choice for high-performance exhaust tuning.

The Borla CrateMuffler Resonator (MPN 400937) is a compact, reversible bottle-style resonator engineered to reduce sound pressure levels (SPL) by approximately 2-3 dB(A). Designed for applications with limited clearance, this straight-through resonator attenuates overall exhaust volume without obstructing flow or degrading engine performance. It is an ideal addition for those looking to transition a Borla S-Type CrateMuffler to a Touring sound level, or as a universal resonator for any 2.25-inch system.

Built from high-quality T-304 austenitic stainless steel, this unit features 100% welded construction for long-term durability and corrosion resistance. The internal high-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound control even under extreme heat. The un-notched necks are designed for weld-in installation, but can be secured with 3-inch wide band clamps (part #18003). This unit features a natural mill finish with no logo embossment for a clean, low-profile look.

• MPN: 400937
• Configuration: 2.25-inch Center Inlet / 2.25-inch Center Outlet
• Dimensions: 3.5-inch Round Body, 10-inch Body Length, 15-inch Overall Length
• Material: T-304 Stainless Steel
• Design: Straight-through, reversible, and un-notched
• Sound Reduction: Approximately 2-3 dB(A)
• Origin: Made in the USA
• Warranty: Borla Million-Mile Warranty

The Borla XR-1 Racing Sportsman (MPN 40086) is a professional-grade universal muffler engineered for competitive racing applications where maximizing exhaust flow is critical. Utilizing patented, race-winning XR-1 Raceline technology, this muffler features a high-velocity straight-through design that reduces backpressure without compromising power. This round series is specifically designed for door cars and roadsters that require a compact footprint to clear chassis or transmission components.

Built from premium austenitic stainless steel for superior durability in high-heat environments, the 40086 features un-notched necks intended for permanent weld-in installation. The fully reversible design provides flexibility during custom exhaust fabrication, ensuring a precise fit regardless of orientation.

• Inlet/Outlet Diameter: 3.5 in. Center / 3.5 in. Center
• Case Dimensions: 5 in. Round Diameter x 15 in. Length
• Overall Length: 20 in.
• Material: T-300 Series Austenitic Stainless Steel
• Technology: Patented XR-1 Raceline straight-through design
• Installation: Un-notched necks for weld-in fitment
• Configuration: Universal and reversible

Specifically engineered for the Ford 5.0L Coyote engine, the Borla CrateMuffler is the industry's first exhaust solution purpose-built to optimize the sound and power of crate and custom engine builds. This unit features Borla's aggressive ATAK (Abusive Tongue and Cheek) sound profile, which is precision-tuned to provide a high-performance note while dramatically reducing or eliminating interior drone.

Constructed from premium T-304 stainless steel, this muffler offers superior corrosion resistance and longevity compared to standard 400-series stainless steel. The design is directional to ensure optimal flow characteristics; the outlet is easily identified by the mounting bracket welded to the endcap for straightforward installation.

• Fits Ford 5.0L Coyote crate and custom applications
• Series: ATAK CrateMuffler
• Inlet/Outlet: 2.5in Offset/Center
• Case Dimensions: 12in x 6in x 10.34in
• Material: T-304 Stainless Steel
• Design: Directional flow with engine-specific acoustic tuning
• Manufacturer Part Number: 400856
• Warranty: Million-Mile Warranty

The Borla CrateMuffler is specifically engineered to optimize the acoustic profile and exhaust flow of the Ford Coyote 5.0L crate engine. Unlike universal mufflers, this unit is tuned for the specific firing order and harmonics of the engine family to significantly reduce or eliminate cabin drone while providing the aggressive S-Type sound level.

• Construction: High-quality T-304 stainless steel for superior corrosion resistance compared to 409-series steel.
• Design: Directional flow configuration with a CNC-manufactured body for precise fitment.
• Dimensions: 2.5-inch inlet/outlet (offset/center) with a 12" x 6" x 10.34" case size.
• Identification: The outlet end is easily identified by the integrated mounting bracket welded to the end cap.
• Customization: Can be paired with Borla resonator 400938 to achieve the milder Touring sound level.
• Manufacturer Part Number: 400855
• Warranty: Million-Mile Warranty.

Designed specifically for Big Block Chevy 396, 402, and 427 engines, the Borla CrateMuffler is the first exhaust solution engineered to optimize both the acoustic profile and power delivery of custom-built and crate motors. This muffler features the high-intensity ATAK (Abusive Tongue and Cheek) sound profile, delivering an aggressive, race-inspired exhaust note while utilizing internal tuning to virtually eliminate cabin drone in cataloged applications.

Constructed from premium T-304 stainless steel, the 400852 CrateMuffler offers superior durability and corrosion resistance compared to standard 400-series materials. The design is directional to ensure optimal flow and sound attenuation; the outlet is easily identified by the mounting bracket welded to the endcap. Precision CNC manufacturing ensures exact tolerances for a clean installation into your custom exhaust system.

• Engine Fitment: Big Block Chevy (BBC) 396, 402, 427
• Sound Profile: Aggressive ATAK Series
• Inlet/Outlet: 2.5" ID (Offset Inlet / Center Outlet)
• Case Dimensions: 14" x 4.35" x 9" (Oval)
• Material: T-304 Stainless Steel
• Manufacturing: CNC machined for precision fit
• Manufacturer Part Number: 400852
• Warranty: Borla Million-Mile Warranty

The Borla XR-1 Racing Sportsman round muffler (MPN 40085) is engineered for high-performance racing applications where space is at a premium. Constructed from premium austenitic stainless steel, this universal muffler utilizes Borla’s patented XR-1 Raceline flow-through technology to maximize exhaust velocity and horsepower without the restrictive baffles of traditional mufflers.

• Design: Compact 5-inch round body profile, ideal for door cars, roadsters, and custom race builds with limited chassis clearance.
• Dimensions: 3-inch center inlet and 3-inch center outlet; 15-inch case length with a 20-inch overall length.
• Materials: Built from high-quality austenitic stainless steel for long-term durability under extreme racing temperatures.
• Installation: Features un-notched necks designed for secure weld-in installation. For clamp-on applications, use a 3-inch wide band clamp (Borla part 18006).
• Versatility: Reversible flow design allows for flexible mounting configurations.

The Borla CrateMuffler (MPN 400844) is the industry's first exhaust solution specifically engineered to optimize the acoustic profile and exhaust flow of crate and custom-built engines. This model is precision-tuned for Small Block Chevy (SBC) Hot 350 and 383 applications, featuring the aggressive ATAK sound technology to deliver a high-performance exhaust note while effectively neutralizing interior drone on cataloged applications.

Constructed from premium T-304 stainless steel, this 14-inch oval muffler offers superior corrosion resistance and durability compared to standard 400-series steels like 409. The directional flow design utilizes a specific internal configuration to maximize power; the outlet is easily identified by the welded mounting bracket on the end cap to ensure correct orientation during installation. Each muffler is CNC-manufactured for precise tolerances and a reliable fit.

• Engine Fitment: Small Block Chevy (SBC) Hot 350 / 383
• Sound Profile: Aggressive ATAK Series
• Inlet/Outlet: 3.00-inch Offset/Center
• Body Dimensions: 14in x 4.35in x 9in Oval
• Material: High-grade T-304 Stainless Steel
• Construction: Precision CNC-machined with directional flow
• Warranty: Borla Million-Mile Warranty

The Borla CrateMuffler is the first exhaust component specifically engineered to optimize the acoustic signature and power delivery of performance crate engines. This S-Type muffler is precision-tuned for the Small Block Chevy (SBC) Hot 350 and 383 engine families, designed to eliminate interior drone while delivering an aggressive, high-performance exhaust note.

Built from premium T-304 stainless steel, this muffler provides superior corrosion resistance and longevity compared to 400-series alternatives. The directional flow design features a specific inlet and outlet orientation; the outlet is identified by the mounting bracket welded to the endcap for a proper installation. For users seeking a more subdued volume, this muffler can be paired with Borla resonator 400939 to achieve a Touring sound level.

• Engine Family: Small Block Chevy (SBC) Hot 350 / 383
• Dimensions: 14" Case Length, 4.35" x 9" Oval Body
• Inlet/Outlet: 3.0" Diameter (Offset/Center)
• Material: T-304 Stainless Steel
• Manufacturing: CNC-machined for precise fitment
• Part Number: 400843
• Warranty: Borla Million-Mile Warranty

The Borla CrateMuffler (MPN 400841) is specifically engineered to optimize the sound and performance of Small Block Chevy 350 and 383 crate engines. Featuring the aggressive ATAK sound profile, this muffler is tuned for this specific engine family to deliver a high-performance exhaust note while dramatically reducing or eliminating cabin drone.

Built from premium T-304 stainless steel, the CrateMuffler offers superior durability and corrosion resistance compared to standard 400-series stainless steel components. The directional flow design utilizes precision CNC manufacturing for an accurate fit. Note that these mufflers are directional for optimal sound tuning; the outlet end is identified by the mounting bracket welded to the endcap.

• Engine Fitment: SBC Hot 350/383 Crate Engines
• Sound Level: ATAK (Aggressive)
• Case Dimensions: 14" x 4.35" x 9" (Oval)
• Inlet/Outlet: 3.00" Offset / 3.00" Offset
• Material: T-304 Stainless Steel
• Manufacturing: CNC Numerical Control
• Part Number: 400841
• Warranty: Million-Mile Warranty

The Borla CrateMuffler (part number 400840) is the industry's first muffler engineered specifically to optimize the acoustic profile and power delivery of SBC Hot 350 and 383 crate engines. Unlike universal mufflers, the CrateMuffler series is precision-tuned for specific engine families to dramatically reduce or eliminate exhaust drone on specified applications.

Constructed from premium T-304 stainless steel, this muffler offers superior corrosion resistance and longevity compared to standard T-400 series (409) alternatives. The directional design features CNC-manufactured internals to ensure an accurate fit and consistent performance. Installation is straightforward, though the unit is flow-specific; the outlet is easily identified by the mounting bracket welded directly to the endcap.

• Engine Fitment: Specifically tuned for SBC Hot 350 and 383 engine families
• Inlet/Outlet Size: 3-inch Offset / Center configuration
• Case Dimensions: 14" L x 4.35" H x 9" W (Oval profile)
• Material: High-grade T-304 stainless steel
• Design: Directional flow (outlet identified by welded bracket)
• Sound Level: Drone-reduction tuning; compatible with resonator 400939 for Touring sound level
• Warranty: Borla Million-Mile Warranty

Designed specifically for Small Block Ford 289 and 302 cubic-inch crate and custom engines, the Borla CrateMuffler is the industry's first exhaust solution tuned for the acoustic and performance requirements of specific engine families. This model features the ATAK (Aggressive Tongue-and-Cheek) sound profile, delivering a high-volume, aggressive exhaust note while utilizing internal geometry to dramatically reduce or eliminate interior drone.

Each CrateMuffler is constructed from premium T-304 stainless steel, providing significantly better durability and corrosion resistance than standard T-400 series or 409 stainless. These units feature a directional flow design; the outlet end is easily identified by the integrated mounting bracket welded to the endcap. Precision CNC manufacturing ensures consistent tolerances and an accurate fit for custom exhaust routing.

• Engine Application: Small Block Ford 289/302 V8
• Sound Level: ATAK (Aggressive)
• Material: T-304 Stainless Steel
• Inlet/Outlet: 2.5" Offset / 2.5" Center (Directional)
• Case Dimensions: 14" L x 4.35" H x 9" W (Oval)
• Manufacturer Part Number: 400832
• Warranty: Million-Mile Warranty

Fits Chevrolet Small Block V8 (SBC) 283, 327, and 350 engines.

The Borla CrateMuffler is the industry's first exhaust solution specifically engineered to optimize the acoustic and power profiles of crate and custom-built engines. This model features Borla's most aggressive ATAK (Abnormally Tuned Applied Kinetics) sound technology, providing a high-volume, performance-oriented exhaust note that remains crisp and clear. These mufflers are precision-tuned for the SBC engine family to eliminate the cabin drone often found with universal components.

Each CrateMuffler is constructed from premium T-304 stainless steel, offering superior corrosion resistance and longevity compared to standard T-400 series or aluminized steel. The internal flow design is directional to maximize scavenging and sound quality; for easy installation, the outlet side is identifiable by a mounting bracket welded directly to the endcap. Precision CNC manufacturing ensures consistent wall thickness and a perfect fit for custom exhaust builds.

• Part Number: 400823
• Engine Family: SBC 283 / 327 / 350
• Sound Level: ATAK (Aggressive)
• Material: High-Grade T-304 Stainless Steel
• Inlet/Outlet: 2.5-inch Offset / Center
• Case Dimensions: 14in x 4.35in x 9in
• Shape: Oval
• Installation: Directional flow (bracket on outlet)
• Warranty: Borla Million-Mile Warranty