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ProXS™ Muffler 2.5″ Dual Inlet/ 2.25″ Dual Outlet, 4″ x 9.5″ Oval, 19″ Long Body, 24″ Overall Length. Notched necks for easy clamp-on installation using 1″ wide band style clamps 18325 (clamps not included). This muffler features an internal X-Pipe for increased performance and improved sound. Notched necks for easy clamp-on installation using 1″ wide band style clamps (clamps not included). Reversible design for installation flexibility. High-quality T-304 Stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it’s made in the USA and backed by BORLA®’s Million-Mile warranty. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
ProXS™ Muffler 2.5″ Dual Inlet/ 2.25″ Dual Outlet, 4″ x 9.5″ Oval, 19″ Long Body, 24″ Overall Length. Internal X-Pipe. Universal Part. Reversible Design. Notched Necks.
Million Mile Warranty

• Alternate muffler with Un-Notched necks is 400286. If clamping, use 3″ wide band clamps 18004.
• Universal muffler. Reversible design. Dual Inlet, dual outlet. Contains an internal X-Pipe.
• 2.5″ Dual Inlet/ 2.5″ Dual Outlet, 4″ x 9.5″ Oval, 19″ Long Body, 24″ Overall Length
• Notched necks are designed for clamp in installation. Use 1″ wide band clamp s18325.

Compact size is perfect for applications with limited space. Reversible design for installation flexibility. Un-Notched necks are designed for weld in installation. If clamping, use 3″ wide band clamp 18004 (clamps not included). High-quality T-304 austenitic stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it’s made in the USA and backed by BORLA®’S Million-Mile warranty. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
Specialty Muffler – S-Type – 2.5″ Center Inlet/ 2.5″ Center Outlet 5″ Round x 10″ Long Body 15″ Overall Length. Universal Part. Reversible Design. Un-Notched Necks.
Million Mile Warranty

• Un-Notched necks are designed for weld in installation. If clamping, use 3″ wide band clamps 18004.
• Alternate muffler/ resonator with notched necks is 400497. Use 1″ wide band clamps 18325.
• Compact size is perfect for applications with limited space
• Universal. Reversible design.

XR-1® Multi-Core Racing Muffler. 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 16″ Long Body 21″ Overall Length. Compact 4″ diameter muffler body is perfect for applications with limited space and can be used on a wide range of vehicles. This muffler is sometimes referred to as a ‘Hot Rod’ muffler. It features BORLA®’S patented Multi-Core 3 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1® mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Muffler Racing Muffler – 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 16″ Long Body 21″ Overall Length. Universal Part. Reversible Design.

• Can be used on a wide range of vehicles. Sometimes referred to as a ‘Hot Rod’ muffler.
• 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 16″ Long Body 21″ Overall Length
• Compact 4″ diameter muffler body is perfect for applications with limited space
• Universal muffler. Reversible design.
• Multi-Core 3 tube internal design

XR-1® Multi-Core Racing Muffler. 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 12″ Long Body 17″ Overall Length. Compact 4″ diameter muffler body is perfect for applications with limited space and can be used on a wide range of vehicles. This muffler is sometimes referred to as a ‘Hot Rod’ muffler. It features BORLA®’S patented Multi-Core 3 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1® mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible dsign for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Muffler Racing Muffler – 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 12″ Long Body 17″ Overall Length. Universal Part. Reversible Design.

• Can be used on a wide range of vehicles. Sometimes referred to as a ‘Hot Rod’ muffler.
• 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 12″ Long Body 17″ Overall Length
• Compact 4″ diameter muffler body is perfect for applications with limited space
• Universal muffler. Reversible design.
• Multi-Core 3 tube internal design

XR-1® Multi-Core Racing Muffler. 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 12″ Long Body 17″ Overall Length. Compact size is perfect for applications with limited space and can be used on a wide range of vehicles. It features BORLA®’S patented Multi-Core 4 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1® mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. There is no BORLA® logo embossment on this part. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Racing Muffler Rotary Engine Equipped Vehicles – 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 12″ Long Body 17″ Overall Length. Universal Part. Reversible Design.
Patented Multi-Core Technology

• 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 12″ Long Body 17″ Overall Length
• Universal muffler. Reversible design. No BORLA® logo embossement.
• Compact design is perfect for applications with limited space
• Can be used on a wide range of vehicles
• Multi-Core 4 tube internal design

XR-1® Multi-Core Racing Muffler. 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 16″ Long Body 21″ Overall Length. Compact size is perfect for applications with limited space and can be used on a wide range of vehicles. It features BORLA®’S patented Multi-Core 4 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1 mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. There is no BORLA® logo embossment on this part. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Racing Muffler Rotary Engine Equipped Vehicles – 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 16″ Long Body 21″ Overall Length. Universal Part. Reversible Design.
Patented Multi-Core Technology

• 3″ Center Inlet/ 3″ Center Outlet 4.25″ x 7.88″ Oval x 16″ Long Body 21″ Overall Length
• Universal muffler. Reversible design. No BORLA® logo embossement.
• Compact design is perfect for applications with limited space
• Can be used on wide range of vehicles
• Multi-Core 4 tube internal design

XR-1® Multi-Core Racing Muffler. 3″ Center Inlet/ 3″ Center Outlet 6.25″ Round x 16″ Long Body 21″ Overall Length. Long body design works well on SUV & truck applications but can be used on a wide range of vehicles. It features BORLA®’S patented Multi-Core 4 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1® mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. There is no BORLA® logo embossment on this part. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Racing Muffler Rotary Engine Equipped Vehicles – 3″ Center Inlet/ 3″ Center Outlet 6.25″ Round x 16″ Long Body 21″ Overall Length. Universal Part. Reversible Design.
Patented Multi-Core Technology

• 3″ Center Inlet/ 3″ Center Outlet 6.25″ Round x 16″ Long Body 21″ Overall Length
• Universal muffler. Reversible design. No BORLA® logo embossement.
• Long body design works well on SUV & truck applications
• Can be used on a wide range of vehicles
• Multi-Core 4 tube internal design

XR-1® Multi-Core Racing Muffler. 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 14″ Long Body 19″ Overall Length. Compact 4″ diameter muffler body is perfect for applications with limited space and can be used on a wide range of vehicles. This muffler is sometimes referred to as a ‘Hot Rod’ muffler. It features BORLA®’S patented Multi-Core 3 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1® mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel will never rust. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. Best of all, it’s made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.
XR-1® Multi-Core Muffler Racing Muffler – 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 14″ Long Body 19″ Overall Length. Universal Part. Reversible Design.

• Can be used on a wide range of vehicles. Sometimes referred to as a ‘Hot Rod’ muffler.
• 2.5″ Center Inlet/ 2.5″ Center Outlet 4″ Round x 14″ Long Body 19″ Overall Length
• Compact 4″ diameter muffler body is perfect for applications with limited space
• Universal muffler. Revesible design.
• Multi-Core 3 tube internal design

High quality austenitic stainless steel. Patented, race-winning XR-1 Raceline technology. 3 options: Offset – Made with the same patented, flow through design as the XR-1 Sportsman oval. The inlet/outlet are offset to the same side of the muffler, to accommodate transmission and frame rail interference on some applications Oval — BORLAs #1 selling racing muffler. Satisfies the needs of most racing applications because it is the lightest, most compact, and highest flowing racing muffler in its class and at a competitive price. Record-holder Hurley Blakeney has run BORLAs on his AA/AT Ford T-Bird because he loves the quieter driver compartment without giving up any power.Round – Made with the same patented, flow through design as the XR-1 Sportsman Oval. This Muffler is 5 inches in diameter and 15 inches long. Designed for door car/ roadster applications that require a compact round muffler.
XR-1® Sportsman Racing Muffler – 2.5″ Center Inlet/ 2.5″ Center Outlet 4.25″ x 7.88″ Oval x 12″ Long Body 17″ Overall Length. Universal Part. Reversible Design.
Million Mile Warranty

• Un-Notched necks are designed for weld in installation. If clamping, use 3″ wide band clamp 18004.
• 2.5″ Center Inlet/ 2.5″ Center Outlet 4.25″ x 7.88″ Oval x 12″ Long Body 17″ Overall Length
• Compact size is perfect for applications with limited space
• Universal muffler. Reversible design.