XR-1(r) Multi-Core Racing Muffler. 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval 16" Body 21" Overall Length. Compact size is perfect for applications with limited space but can be used on a wide range of vehicles including rotary engine equipped vehicles. It features BORLA(r)'S patented Multi-Core 3 tube design for maximum flow, horsepower and torque. The Multi-Core portion of XR-1(r) mufflers flows better than straight tubing. Reversible design for installation flexibility. T-304 Stainless steel for superior corrosion resistance. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High temperature T-304 stainless steel wool packing 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.