Made from aircraft-quality high quality austenitic stainless steel and BORLA XR-1 Raceline Exhaust Technology. This unique, durable race muffler uses oval tubing and incorporates a slim profile for maximum ground clearance while maintaining significant sound attenuation. The choice of champions of the Hooters ProCup Stock Car Series. BORLA-powered cars have dominated this series since being allowed in. Recommended by winning race teams and top Hooters Series engine builders alike.