For over 4 decades, BORLA® Exhaust has been the choice of Mustang experts. Major players in the racing industry and leading tuners from Roush, Steeda, Saleen and Ford Racing to the Shelby 427 Cobra have relied on BORLA®. This 2.5" diameter Cat-Back™ system bolts behind the factory H-pipe and is lighter than the factory system. BORLA® experience and advance engineering have produced the classic "S-Type" exhaust with outstanding flow numbers that generate great power enhancements, with no drone inside the vehicle. These attributes, coupled the BORLA® sound of power and big single 4" round chrome on T-304 stainless steel tips on each muffler assembly, proclaim this Stang is all business. Airflow management and exhaust engineering is a science with which BORLA® has more experience than anyone in the exhaust aftermarket. The performance matches the famous BORLA® systems of the past but with a unique muffler and exhaust configuration canceling additional high frequency sound waves. Delivering a significant increase in exhaust flow CFM from the factory system which, as most engine builders will confirm, accounts for the dramatic power improvements. Perhaps more importantly, this added flow maximizes performance for other aftermarket enhancements installed on the Mustang because all BORLA&reg