The Borla XR-1 Racing Sportsman 40942 is a universal high-flow muffler engineered for competitive racing applications where space and weight are at a premium. Utilizing Borla's patented flow-through technology, this XR-1 Raceline series muffler provides maximum exhaust velocity and power while reducing interior cabin noise. This model is constructed from premium austenitic stainless steel for superior durability under high-heat racing conditions.

This universal muffler features a reversible design for flexible mounting and un-notched necks designed primarily for weld-in installation. For those preferring a clamp-on setup, a 3-inch wide band clamp (Borla part #18004) is required. Its compact oval dimensions make it an ideal solution for vehicles with limited chassis or transmission clearance.

• Series: XR-1 Racing Sportsman
• Manufacturer Part Number: 40942
• Inlet/Outlet: 2.5" Center / 2.5" Center
• Case Dimensions: 4.25" x 7.88" Oval
• Case Length: 16"
• Overall Length: 21"
• Material: Austenitic Stainless Steel
• Design: Reversible flow-through design
• Installation: Un-notched necks for weld-in; requires 18004 clamp for bolt-on use

The Borla XR-1 Racing Sportsman (MPN: 40941) is a universal, reversible oval muffler engineered for high-performance racing applications where space is limited but maximum flow is required. Utilizing patented XR-1 Raceline technology, this muffler provides a straight-through design that reduces backpressure and optimizes exhaust velocity without sacrificing sound control in the driver compartment.

Constructed from premium austenitic stainless steel, the 40941 is built to withstand the extreme heat and vibration encountered in competitive motorsports. Its compact 12-inch body makes it a versatile choice for chassis with tight clearances, such as door cars or roadsters. The un-notched necks are specifically designed for secure weld-in installation, ensuring a leak-free connection for track use.

• Inlet / Outlet Diameter: 2.5 in. (Center / Center)
• Case Dimensions: 4.25 in. x 7.88 in. Oval
• Case Length: 12 in.
• Overall Length: 17 in.
• Material: Austenitic Stainless Steel
• Design: Reversible Flow-Through Technology
• Installation: Un-notched necks for weld-in; compatible with 3-inch wide band clamps
• Manufacturer Part Number: 40941

The Borla S-Type 40842S universal muffler delivers the signature aggressive exhaust note and high-flow performance for custom exhaust applications. Engineered for tight spaces, its compact, reversible housing allows for maximum installation flexibility. This muffler is built from premium T-304 austenitic stainless steel, ensuring it will never rust, and features 100% welded construction for long-term structural integrity.

Internally, the free-flow design minimizes backpressure while high-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound control without the packing blowout common in lesser mufflers. The un-notched necks are specifically designed for a secure weld-in installation; if you prefer clamping, 3-inch wide band clamps (part 18004) are required.

• Inlet/Outlet Diameter: 2.5 in
• Part Type: Universal Muffler (Weld-in)
• Series: S-Type
• Material: T-304 Stainless Steel
• Finish: Natural Mill
• Neck Style: Un-notched
• Internal Construction: Straight-through with CFF acoustic material
• Manufacturer Part Number: 40842S
• Warranty: Million-Mile Warranty

The Borla ProXS 40670 muffler is engineered for high-performance exhaust applications requiring a single 3-inch inlet and dual 2.25-inch outlets. Featuring a center-in/dual-out configuration, this reversible design provides maximum installation flexibility, allowing it to be used in either single-to-dual or dual-to-single exhaust layouts.

Built for durability, the 40670 is constructed from premium T-304 austenitic stainless steel to prevent rust and corrosion. Its 100% welded body ensures structural integrity, while the straight-through, free-flow internal design reduces backpressure to optimize engine efficiency. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material, delivering a refined tone without the drone associated with lower-quality packing.

• Inlet Diameter: 3.00 inches (Center)
• Outlet Diameter: 2.25 inches (Dual)
• Muffler Shape: Oval
• Material: T-304 Stainless Steel
• Construction: 100% welded with CFF acoustic packing
• Finish: Natural mill finish (suitable for brushing or polishing)
• MPN: 40670
• Manufacturing: Made in the USA
• Warranty: Borla Million-Mile Warranty

The Borla Turbo XL Series universal performance muffler is engineered for custom exhaust applications where maximum flow and long-term durability are essential. Constructed from premium T-304 austenitic stainless steel, this muffler is built to resist corrosion and withstand the thermal stress of high-performance driving. Its 100% welded construction ensures structural integrity, even in demanding environments.

The internal free-flow design minimizes backpressure to improve engine efficiency, while high-temperature continuous-filament fiber (CFF) acoustic material provides refined sound control. Featuring a reversible design, this unit offers maximum installation flexibility for various chassis configurations and custom pipe routing.

• Series: Turbo XL Performance
• Inlet/Outlet Diameter: 2.5 inches
• Material: T-304 Austenitic Stainless Steel
• Construction: 100% Welded
• Acoustic Material: Continuous-Filament Fiber (CFF)
• Finish: Natural Mill (Polishable)
• Part Number: 40665

The Borla ProXS series is engineered for high-performance exhaust applications where space is at a premium. Featuring a 2.5-inch inlet and outlet in a center/offset oval configuration, this muffler utilizes a reversible design to provide maximum installation flexibility for custom fabrications and tight chassis clearances.

Constructed from premium T-304 austenitic stainless steel, the 40659 is built to resist corrosion and withstand high heat cycles. The 100% welded case ensures structural integrity, while the internal free-flow design minimizes backpressure for improved engine efficiency. To manage sound profile without restricting flow, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material.

• Inlet/Outlet Diameter: 2.5in
• Configuration: Center/Offset
• Shape: Oval
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Brushed/Polished ready)
• Internal Packing: Continuous-Filament Fiber (CFF)
• Manufacturer Part Number: 40659

The Borla ProXS 40658 muffler is engineered for custom exhaust applications where space is at a premium. This high-performance oval muffler features a free-flow internal design to reduce backpressure while utilizing high-temperature continuous-filament fiber (CFF) acoustic material for precise sound attenuation without restricting flow.

Constructed from 100% welded T-304 austenitic stainless steel, this unit provides superior corrosion resistance and structural integrity. The reversible design allows for installation flexibility to accommodate center/offset routing, and the natural mill finish can be brushed or polished prior to installation to match your vehicle's aesthetic.

• Series: ProXS
• Inlet/Outlet Diameter: 2.25in
• Configuration: Center / Offset
• Shape: Oval
• Material: T-304 Stainless Steel
• Construction: 100% Welded
• Acoustic Material: Continuous-Filament Fiber (CFF)
• Finish: Natural Mill
• Manufacturer Part Number: 40658

The Borla Universal Performance muffler (40657) is engineered for custom exhaust applications where space is at a premium. Its compact footprint and reversible design provide maximum installation flexibility for various chassis configurations. This muffler features a straight-through, free-flow internal design to minimize backpressure and optimize exhaust scavenging.

Constructed from premium T-304 austenitic stainless steel, this unit is built to withstand high-heat environments without rusting. The 100% welded assembly ensures long-term structural integrity, while the internal high-temperature continuous-filament fiber (CFF) acoustic material provides consistent sound suppression without the packing degradation common in lesser mufflers.

• Inlet/Outlet Diameter: 2.0in
• Material: T-304 Austenitic Stainless Steel
• Construction: 100% Welded with CFF Acoustic Fiber
• Finish: Natural Mill (ready to be brushed or polished)
• Configuration: Reversible for flexible routing
• Manufacturer Part Number: 40657

This Borla Turbo XL universal muffler features a transverse flow design, specifically engineered for custom exhaust systems or as a replacement for GM F-Body (Camaro and Firebird) applications where the muffler mounts behind and parallel to the rear axle. The configuration includes a single 2.5-inch offset inlet and dual 2.5-inch offset outlets; the inlet and one outlet are located on one end of the case, while the second outlet is positioned on the opposite end. The reversible case design allows for maximum installation flexibility.

Constructed from premium T-304 austenitic stainless steel, this muffler is built for long-term durability and corrosion resistance. The 100% welded assembly provides superior structural integrity, while the high-temperature continuous-filament fiber (CFF) acoustic material ensures consistent sound control without the blowout risks of traditional packing. The free-flow internal design reduces backpressure to improve exhaust scavenging and overall performance. Necks are un-notched, requiring weld-in installation or the use of 18004 band clamps.

• Manufacturer Part Number: 40477
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Brushed/Polished capable)
• Inlet/Outlet Diameter: 2.5in (Offset configuration)
• Case Dimensions: 19in L x 10.25in W x 5.5in H
• Construction: 100% Welded, Reversible Design
• Acoustic Material: Continuous-Filament Fiber (CFF)
• Warranty: Borla Million-Mile Warranty

The Borla 40474 is a universal transverse-flow muffler originally engineered for the GM F-Body Camaro and Firebird chassis, where the unit mounts behind and parallel to the rear axle. Its reversible, transverse design makes it a versatile solution for custom exhaust fabrication on vehicles requiring a space-saving, cross-flow configuration.

Constructed from high-quality T-304 austenitic stainless steel, this muffler is built to resist corrosion and survive the harshest road conditions. The 100% welded case contains high-temperature continuous-filament fiber (CFF) acoustic material to provide sound attenuation without restricting exhaust velocity. The natural mill finish offers a clean look that can be brushed or polished to your preference before installation.

• Inlet Diameter: 3in (Single Offset)
• Outlet Diameter: 2.5in (Dual Offset)
• Case Dimensions: 19in x 10.25in x 5.5in
• Material: T-304 Stainless Steel
• Inlet/Outlet Configuration: Inlet and one outlet on one end, second outlet on opposite end
• Neck Style: Un-notched (designed for weld-in installation)
• MPN: 40474

For clamp-on installations, use band clamps (Borla 18004 and 18006). This unit is backed by Borla's Million-Mile warranty.

The Borla Pro-XS Universal Muffler (40364) is a high-performance solution designed for custom exhaust fabrication. Featuring a reversible flow design, this muffler provides maximum installation flexibility for tight chassis clearances. It is constructed from premium T-304 austenitic stainless steel, ensuring it will not rust or oxidize over time, even under extreme thermal stress.

Built with 100% welded seams for superior structural integrity, the Pro-XS uses a straight-through free-flow internal design to reduce backpressure. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material to maintain a deep, controlled tone without the common rasp of lesser universal units.

• Inlet/Outlet Diameter: 2.5 inches
• Configuration: Center Inlet / Center Outlet
• Material: T-304 Austenitic Stainless Steel
• Finish: Natural Mill (Can be brushed or polished)
• Internal Construction: 100% Welded with CFF acoustic packing
• Flow Design: Straight-through, Reversible
• Manufacturer Part Number: 40364
• Origin: Made in the USA
• Warranty: Borla Million-Mile Warranty

The Borla Pro-XS 40363 is a universal-fit muffler engineered for custom exhaust systems where durability and high-flow performance are required. This muffler features a reversible center-in/center-out design, providing maximum installation flexibility for fabricators and enthusiasts. Constructed from T-304 austenitic stainless steel, the 100% welded body is built to resist corrosion and withstand the high thermal loads of performance driving.

The straight-through, free-flow internal geometry minimizes backpressure while utilizing high-temperature continuous-filament fiber (CFF) acoustic material to deliver a controlled, aggressive exhaust note without the drone often associated with lesser mufflers. The natural mill finish provides a clean look out of the box and can be brushed or polished prior to installation to match your vehicle's aesthetic.

• Inlet/Outlet Diameter: 2.25in
• Configuration: Center Inlet / Center Outlet
• Material: T-304 Austenitic Stainless Steel
• Construction: 100% Welded
• Acoustic Packing: High-temperature continuous-filament fiber (CFF)
• Finish: Natural Mill
• Design: Reversible flow for flexible mounting
• Warranty: Borla Million-Mile Warranty
• Manufacturer Part Number: 40363
• Origin: Made in the USA

The Borla ProXS series universal muffler (MPN 40359) is engineered for custom exhaust builders seeking a high-flow, corrosion-resistant solution. Manufactured from premium T-304 austenitic stainless steel, this muffler is designed to resist oxidation and rust over the life of the vehicle. The 100% welded construction provides maximum structural integrity, ensuring the case remains secure under high exhaust temperatures and vibrations.

The straight-through, free-flow internal design reduces backpressure to improve exhaust scavenging and performance. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material to provide a refined tone without sacrificing flow. Its reversible design offers installation flexibility, allowing the 3-inch ports to be used in either a center or offset configuration.

• Inlet/Outlet Diameter: 3.00in
• Case Dimensions: 4in x 9.5in x 14in
• Configuration: Center Inlet / Offset Outlet (Reversible)
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Polishable)
• Internal Packing: High-temp Continuous-Filament Fiber (CFF)
• Manufacturer Part Number: 40359

The Borla ProXS Universal Muffler (40358) is engineered for custom exhaust fabrications and street performance applications where space and durability are critical. Utilizing a straight-through, free-flow design, this muffler minimizes backpressure to optimize exhaust gas velocity compared to restrictive chambered mufflers.

Built from premium T-304 austenitic stainless steel, the 40358 is designed to resist oxidation and corrosion in harsh environments. Its 100% welded construction provides superior structural integrity, while the reversible design allows for installation flexibility across various chassis configurations. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material to maintain a consistent, deep tone without the packing degradation common in lower-tier mufflers.

• Manufacturer Part Number: 40358
• Inlet/Outlet Diameter: 2.5 inches
• Material: T-304 Austenitic Stainless Steel
• Finish: Natural Mill (Ready for brushing or polishing)
• Configuration: Reversible Center/Center
• Internal Acoustic Material: High-temperature continuous-filament fiber (CFF)
• Construction: 100% Welded

The Borla ProXS Universal Muffler (40357) is engineered for custom exhaust fabrication, providing a high-flow, straight-through design that reduces backpressure compared to restrictive factory units. Featuring a reversible center/offset configuration, this muffler offers maximum installation flexibility for tight chassis clearances.

Built for longevity, it is constructed from T-304 austenitic stainless steel to prevent rust and corrosion. The case is 100% welded for superior structural integrity under high-heat conditions, while the high-temperature continuous-filament fiber (CFF) acoustic packing delivers a refined, deep exhaust note without sacrificing flow. The natural mill finish provides a clean look that can be brushed or polished prior to installation.

• Manufacturer Part Number: 40357
• Inlet/Outlet Diameter: 2.25 inches
• Configuration: Center / Offset (Reversible)
• Case Dimensions: 14" Length x 4" Height x 9.5" Width
• Material: T-304 Austenitic Stainless Steel
• Internal Construction: 100% Welded Straight-Through Free Flow
• Acoustic Material: High-Temperature Continuous-Filament Fiber (CFF)

This Borla Universal Pro-XS muffler (MPN 40353) is engineered for custom exhaust fabrication where high-flow performance and long-term durability are required. Featuring a straight-through, free-flow design, this muffler reduces backpressure to help optimize engine efficiency and power output.

Constructed entirely from premium T-304 austenitic stainless steel, the Pro-XS series is designed to withstand harsh environments without rusting. The 100% welded construction provides the structural integrity needed for high-vibration applications. For sound management, Borla utilizes high-temperature continuous-filament fiber (CFF) acoustic material, which delivers a controlled exhaust note without the packing degradation or blowout common in lesser-quality mufflers.

• Material: T-304 Austenitic Stainless Steel
• Inlet/Outlet Diameter: 3.0"
• Configuration: Offset Inlet / Offset Outlet
• Case Dimensions: 14" L x 9.5" W x 4" H
• Internal Design: Reversible straight-through for installation flexibility
• Finish: Natural mill finish (suitable for brushing or polishing)
• Manufacturer Part Number: 40353

The Borla Pro-XS Universal Muffler (40352) provides a high-performance exhaust solution for custom builds and street applications. Engineered with a straight-through, free-flow design, this muffler reduces backpressure to improve engine efficiency while delivering the signature Borla exhaust note. The reversible offset/offset configuration offers maximum installation flexibility for various chassis and piping layouts.

Constructed from premium T-304 austenitic stainless steel, the 40352 is built to resist corrosion and withstand high heat. The 100% welded assembly ensures structural integrity under high-stress conditions, while the interior is packed with high-temperature continuous-filament fiber (CFF) for consistent acoustic control and long-term durability. The natural mill finish provides a clean look that can be brushed or polished prior to installation.

• Manufacturer Part Number: 40352
• Inlet/Outlet Diameter: 2.5 in.
• Inlet/Outlet Configuration: Offset / Offset (Reversible)
• Case Shape: Oval
• Material: T-304 Stainless Steel
• Construction: 100% Welded
• Acoustic Packing: High-temp Continuous-Filament Fiber (CFF)
• Finish: Natural Mill

The Borla Pro-XS 40351 is a universal performance muffler engineered for custom exhaust systems requiring a compact oval footprint and superior durability. Constructed from high-quality T-304 austenitic stainless steel, this muffler is designed to resist corrosion and withstand the extreme thermal cycles of high-performance driving.

The straight-through, free-flow design minimizes backpressure to improve engine efficiency, while the high-temperature continuous-filament fiber (CFF) acoustic material provides refined sound control. Its 100% welded construction ensures long-term structural integrity, and the reversible offset/offset configuration offers maximum installation flexibility for tight underbody clearances.

• Manufacturer Part Number: 40351
• Tubing Diameter: 2.25 inches
• Case Dimensions: 14" x 4" x 9.5"
• Configuration: Offset Inlet / Offset Outlet (Reversible)
• Material: T-304 Stainless Steel
• Finish: Natural Mill (can be brushed or polished)
• Internal Construction: Free-flow with CFF acoustic packing

The Borla Pro-XS Turbo XL muffler (MPN 40349) is engineered for high-performance exhaust customization, featuring a reversible design that accommodates both single-inlet/dual-outlet and dual-inlet/single-outlet configurations. Built from T-304 austenitic stainless steel, this muffler is designed to resist corrosion and maintain structural integrity under extreme heat and road conditions.

• Inlet Configuration: 3" Center
• Outlet Configuration: 2.5" Dual
• Case Dimensions: 19" L x 9.5" W x 4" H (Oval)
• Material: T-304 Stainless Steel with a natural mill finish
• Construction: 100% welded for maximum durability
• Acoustic Packing: High-temperature continuous-filament fiber (CFF)
• Flow Design: Straight-through, free-flow core for reduced backpressure
• Warranty: Borla Million-Mile Warranty
• Origin: Made in the USA

The natural mill finish can be easily brushed or polished to your preferred luster prior to installation. By utilizing a continuous-filament fiber (CFF) acoustic material, Borla ensures consistent sound suppression and eliminates the packing blowout often found in lower-quality mufflers.

The Borla Pro-XS 40348 is a high-performance universal muffler designed for custom exhaust applications requiring a single 2.5-inch inlet and dual 2.5-inch outlets. Featuring a fully reversible design, this muffler can also be utilized in dual-inlet/single-outlet configurations, providing maximum installation flexibility for various drivetrain and chassis layouts.

Constructed from premium T-304 austenitic stainless steel, the Pro-XS series is built to resist corrosion and oxidation. The 100% welded case ensures structural integrity under high heat and pressure, while the high-temperature continuous-filament fiber (CFF) acoustic material provides long-lasting sound attenuation without the packing blowout common in lesser fiberglass-filled mufflers. The internal free-flow design minimizes backpressure to optimize exhaust scavenging and performance.

• Inlet/Outlet: 2.5" Tubing (Center Inlet / Dual Outlet)
• Case Shape: 4" x 9.5" Oval
• Overall Length: 19"
• Material: T-304 Stainless Steel
• Finish: Natural Mill (Polishable)
• Construction: 100% Welded for maximum strength
• MPN: 40348
• Warranty: Borla Million-Mile Warranty

The Borla Pro-XS 40347 is a universal turbo-style muffler engineered for high-performance custom exhaust applications. Manufactured from premium T-304 austenitic stainless steel, this muffler offers maximum resistance to corrosion and rust, ensuring long-term durability over T-409 or aluminized steel alternatives. Its reversible design provides versatile installation options, while the 100% welded construction maintains structural integrity under extreme thermal stress.

Designed for optimal flow, the internal straight-through configuration reduces backpressure to help improve engine efficiency. Acoustic control is managed by high-temperature continuous-filament fiber (CFF) material, which produces a deep, refined exhaust note without the rasp often found in lesser mufflers. The natural mill finish can be used as-is or polished to a mirror shine for show-quality builds.

• Manufacturer Part Number: 40347
• Inlet/Outlet Diameter: 2.00in (Center/Center configuration)
• Case Dimensions: 14in Length x 9.5in Width x 4in Height
• Material: T-304 Stainless Steel
• Internal Packing: High-temperature CFF acoustic material
• Design: Reversible, 100% Welded, No Notch

The Borla Pro-XS series (MPN 40346) is a high-performance universal muffler designed for custom exhaust applications where maximum flow and durability are required. This 14-inch oval muffler features a straight-through, free-flow core that reduces backpressure to improve engine efficiency and power output. Its reversible design allows for flexible installation, making it a versatile choice for builders and fabricators.

• Manufactured from premium T-304 austenitic stainless steel for superior corrosion resistance and longevity.
• 100% welded construction ensures structural integrity under high heat and vibration.
• Packed with high-temperature continuous-filament fiber (CFF) acoustic material for consistent sound control without the blowout associated with lower-grade packing.
• Natural mill finish can be brushed or polished to your preferred aesthetic prior to installation.
• Specifications: 2in inlet/outlet diameter, 4in x 9.5in oval body, 14in body length, Offset/Offset configuration.
• Manufacturer Part Number: 40346

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 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