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