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