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

Designed specifically for Small Block Chevy Hot 350 and 383 crate engines, the Borla CrateMuffler (MPN: 400820) is engineered to optimize the acoustics and flow of these specific engine families. Featuring the aggressive ATAK sound profile, this muffler is tuned to deliver a high-volume exhaust note while dramatically reducing or eliminating interior drone.

• Construction: Premium T-304 stainless steel for superior corrosion resistance and durability over 400-series alternatives
• Sound Series: ATAK (Aggressive Tongue-and-Cheek) sound level
• Configuration: 2.5-inch offset inlet / 2.5-inch center outlet
• Case Dimensions: 14-inch length x 4.35-inch height x 9-inch width (Oval)
• Directional Flow: Optimized internal design; outlet is identified by the mounting bracket welded to the endcap
• Manufacturing: Precision CNC-manufactured for an accurate fit
• Warranty: Manufacturer Million-Mile Warranty

The Borla CrateMuffler series provides a custom-tuned exhaust solution for high-performance crate engines, ensuring the sound matches the build quality of your Small Block Chevy.

The Borla Boomer Thumper is a high-performance universal muffler engineered for street and track applications where exhaust flow and sound control are paramount. Utilizing Borla's patented race-winning technology, this muffler is designed to reduce backpressure while delivering a signature aggressive exhaust note. This is a universal-fit component requiring professional installation and custom piping.

Constructed entirely from aircraft-grade T-304 austenitic stainless steel, the 40057 features 100% welded seams for maximum structural integrity under high heat. The internal core is packed with high-temperature continuous-filament fiber (CFF) acoustic material, ensuring long-term sound control without the blowout issues common in inferior glass-packed mufflers.

• Inlet Diameter: 2.25in (2-1/4")
• Tip Diameter: 4in Round fully polished integrated tip
• Body Shape: Oval Thumper series
• Material: T-304 Austenitic Stainless Steel
• Finish: Fully polished body and tip
• Construction: 100% welded for durability
• Internal Packing: High-temp continuous-filament fiber (CFF)
• Manufacturing: Made in the USA
• Warranty: Borla Million-Mile Warranty
• Manufacturer Part Number: 40057

This Borla Heavy Duty series universal muffler is specifically engineered for truck and SUV applications that require a long-body design for optimal sound attenuation. Constructed from premium T-304 austenitic stainless steel, this 100% welded muffler is built to resist corrosion and handle the thermal stress of high-mileage use.

• Inlet/Outlet: 3" center-inlet and 3" center-outlet configuration.
• Case Dimensions: 24" body length with a 6.75" round diameter.
• Installation: Features notched necks designed for secure clamp-on installation using 1" wide band style clamps (Borla 18330 or 18327, sold separately). For un-notched necks, see part 400436.
• Internal Design: Straight-through free-flow core maximizes exhaust velocity while high-temperature continuous-filament fiber (CFF) acoustic material provides precise sound control without restrictive baffles.
• Versatility: Fully reversible design allows for flexible installation orientations.

The natural mill finish can be brushed or polished to your preference before installation. This American-made muffler is backed by the Borla Million-Mile Warranty.

The Borla S-Type 400497 is a universal, high-performance muffler designed for custom exhaust builds where space is at a premium. Featuring a compact 5-inch round body and a 10-inch length, this muffler utilizes Borla's straight-through, free-flow design to maximize exhaust velocity while providing the aggressive S-Type sound profile. The reversible configuration allows for total installation flexibility in various chassis layouts.

• Material: Constructed from premium T-304 austenitic stainless steel for superior corrosion resistance and durability.
• Build: 100% welded construction with a natural mill finish that can be brushed or polished.
• Acoustics: Packed with high-temperature continuous-filament fiber (CFF) for consistent sound control and longevity.
• Installation: Features notched necks specifically designed for secure clamp-on installation using 1-inch wide band-style clamps (Borla 18325, sold separately).
• Specifications: 2.5-inch inlet and outlet diameters; 5-inch round case; 10-inch body length.

Handcrafted in the USA and backed by the Borla Million-Mile warranty, this muffler (MPN 400497) is built to outlast the vehicle. For a version with un-notched necks, see Borla part 40842S.

The Borla Pro-XS 400496 is a universal oval muffler designed for high-performance exhaust customization. This 2.5-inch center inlet/outlet muffler features notched necks, specifically engineered for secure and straightforward clamp-on installation. Its reversible design offers maximum flexibility for custom exhaust routing and tight packaging constraints.

• Manufactured from premium T-304 austenitic stainless steel for superior corrosion resistance and durability.
• 100% welded construction ensures structural integrity under high heat and vibration.
• High-flow straight-through design minimizes backpressure to improve exhaust scavenging and performance.
• Continuous-filament fiber (CFF) acoustic material provides long-lasting sound control without packing degradation.
• Natural mill finish allows for custom brushing or polishing to match your vehicle's aesthetic.
• Back-to-back testing shows increased flow over standard baffled mufflers.
• Backed by the Borla Million-Mile Warranty.

MPN: 400496

The Borla Pro-XS Universal Muffler (400495) is engineered for custom exhaust builds requiring a balance of maximum flow and precise sound attenuation. Built with an oval body and a free-flow internal design, this muffler minimizes backpressure to optimize engine efficiency. The notched neck design is specifically tailored for straightforward clamp-on installation, though it can also be welded for a permanent bond.

• Manufactured from T-304 austenitic stainless steel for superior corrosion resistance and longevity.
• 100% welded construction ensures structural integrity in high-vibration and high-heat environments.
• Reversible design provides maximum installation flexibility for various chassis configurations.
• Utilizes high-temperature continuous-filament fiber (CFF) acoustic material for consistent sound control without degradation.
• Natural mill finish allows for custom brushing or polishing prior to installation.

• Manufacturer Part Number: 400495
• Inlet/Outlet Diameter: 2.25in
• Inlet/Outlet Type: Notched (Clamp-on compatible)
• Body Shape: Oval
• Material: T-304 Stainless Steel
• Warranty: Borla Million-Mile Warranty

The Borla ProXS 400493 is a high-performance universal muffler engineered for custom exhaust systems requiring a dual inlet and dual outlet configuration. This 4" x 9.5" oval muffler features an integrated internal X-pipe, which synchronizes exhaust pulses to increase scavenging efficiency and provide a balanced, aggressive sound profile. Built from premium T-304 stainless steel, the 100% welded case is designed to withstand extreme temperatures and resist corrosion for the life of the vehicle.

• Material: High-quality T-304 stainless steel with a natural mill finish.
• Internal Design: Straight-through high-flow core with an internal X-pipe and high-temperature continuous-filament fiber (CFF) acoustic packing.
• Case Dimensions: 4" x 9.5" oval body, 19" case length, and 24" overall length.
• Inlet/Outlet: 2.5-inch dual inlet and 2.5-inch dual outlet.
• Installation: Reversible design for flexible mounting; includes notched necks for secure clamp-on fitment.
• Hardware Note: Requires 1-inch wide band-style clamps (Borla 18325) for installation; clamps sold separately.
• Warranty: Covered by the Borla Million-Mile warranty.

The Borla Pro-XS series universal muffler (MPN 400491) is engineered for custom exhaust builders seeking a balance of high-flow performance and durable construction. This oval-bodied muffler features a 3-inch offset inlet and outlet with notched necks, facilitating straightforward clamp-on installation or secure welding.

Constructed from premium T-304 austenitic stainless steel, the 400491 is built to resist corrosion and withstand high-heat environments. The internal free-flow design uses high-temperature continuous-filament fiber (CFF) acoustic material for precise sound control without compromising exhaust velocity. Its fully reversible design provides maximum flexibility for various chassis configurations.

• 3-inch offset inlet and outlet with notched necks for easy installation
• 100% welded T-304 stainless steel construction for maximum durability
• High-temperature CFF acoustic material for superior sound management
• Straight-through free-flow design to improve exhaust performance
• Natural mill finish suitable for brushing or polishing
• Reversible design for versatile mounting options
• Made in the USA and backed by a Million-Mile warranty

The Borla Pro-XS Universal Muffler (MPN 400490) is a performance-driven solution for custom exhaust fabrication, designed to deliver a deep tone without sacrificing flow. Built for longevity, this muffler is constructed from premium T-304 austenitic stainless steel to resist corrosion and is 100% welded for maximum structural integrity under high-heat conditions.

The straight-through, free-flow design minimizes backpressure while high-temperature continuous-filament fiber (CFF) acoustic material provides refined sound control. Featuring notched necks for secure clamp-on installation and a reversible internal configuration, this unit offers the flexibility needed for complex chassis routing. The natural mill finish can be easily brushed or polished to match your vehicle's aesthetic.

• Material: T-304 Stainless Steel
• Inlet/Outlet: 2.5" (Offset/Offset Notched)
• Body Shape: Oval
• Construction: 100% Welded
• Internal Packing: Continuous-Filament Fiber (CFF)
• Installation: Notched necks for clamp-on or weld-on fitment
• Warranty: Borla Million-Mile Warranty
• Part Number: 400490

The Borla Pro-XS Universal Muffler (400489) is engineered for custom exhaust fabrication, offering a high-flow solution with maximum durability. This oval-body muffler features 2.25-inch offset/offset notched necks designed for secure clamp-on installation and a reversible configuration to accommodate various mounting requirements. Constructed from premium T-304 austenitic stainless steel, this unit is built to resist corrosion and withstand high-heat environments.

• High-Quality Materials: T-304 austenitic stainless steel construction with 100% welded seams for superior structural integrity.
• Advanced Sound Dampening: High-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound control without the blowout associated with lower-grade packings.
• Performance Engineering: A high-velocity free-flow internal design reduces backpressure while maintaining a refined exhaust note.
• Versatile Finish: The natural mill finish serves as a durable base that can be brushed or polished to a mirror shine prior to installation.
• Reliability: Manufactured in the USA and backed by the Borla Million-Mile warranty.

Specifications: 2.25" Inlet/Outlet, Offset/Offset configuration, Notched necks, Universal fitment.

The Borla PRO-XS 400487 universal muffler is engineered for high-performance custom exhaust applications requiring a single 3-inch center inlet and dual 2.5-inch outlets. Its reversible design offers maximum installation flexibility, allowing it to function effectively in both single-to-dual and dual-to-single configurations.

Constructed from premium T-304 austenitic stainless steel, this muffler is built for longevity and superior corrosion resistance. The 100% welded body houses a straight-through, free-flow internal design packed with high-temperature continuous-filament fiber (CFF) for precise acoustic control without restricting exhaust gas velocity. The notched necks simplify clamp-on installation for fabricators and DIYers alike.

• Manufacturer Part Number: 400487
• Inlet Configuration: 3.00in (Center)
• Outlet Configuration: 2.50in (Dual)
• Case Dimensions: 19in L x 4in H x 9.5in W
• Material: T-304 Stainless Steel with Natural Mill Finish
• Internal Construction: 100% Welded with CFF Acoustic Material
• Installation: Notched necks for clamp-on or weld-on fitment
• Warranty: Borla Million-Mile Warranty

Proudly manufactured in the USA, the PRO-XS series delivers the durability and tone expected from the industry leader in stainless steel exhaust systems.