Borla XR-1 Racing Mufflers Fittings & Hoses Whether you're building a canyon

Whether you're building a canyon carver or a reliable daily

Powdercoat finish provides years of corrosion protection

The tube-and-fin design features 11 rows of 1" coolant tubes for maximum surface area

this support shaft is the foundation of a 4L80E that can handle 8-second quarter-mile passes without breaking

Borla XR-1 Racing Mufflers Fittings & Hoses Whether you're building a canyonBorla XR 1 Racing Mufflers (Mufflers) are purpose built for high horsepower applications where minimizing backpressure is critical. Originally developed for NASCAR and endurance racing the XR 1 uses a straight through design with Borla's patented Multi Core technology to achieve near zero flow restriction while producing a controlled aggressive exhaust note. These mufflers are the choice for builds producing 1100+ hp where every pound of backpressure