Borla Performance Industries offers a slick bolt - on performance upgrade for the popular 2005 - 2009 Ford Mustang V6 4.0L. Borla has an impressive heritage of Mustang exhausts, from the Grand - Am Champion Ford Racing Mustangs to the Hot Cobra R. The long list of Ford legends who have relied upon Borla for their street and race cars includes Roush, Gentilozzi, Steeda, Saleen, Maffucci, Mihovetz, Bondurant and Shelby. Borla has built many Mustang V6 project cars and considers the Mustang one of their prime muscle cars. The R D staff dove into the V6 and created a superbly tuned Axle - Back exhaust (PN 11751) that exhibits solid double - digit horsepower numbers from the 2.5 exhaust and exits with a large 4 round, rolled, angle cut Borla embossed bright chrome on T - 304 stainless steel tip. As usual, the Borla system is created with CNC mandrel bent, lightweight, durable, aircraft grade high quality T - 304 stainless. Demonstrating an impressive 724cfm, it's an amazing 346cfm increase which accounts for the dramatic power gains along with subsequent mileage improvements. Borla backs up this and all their street car exhausts with an industry leading no - strings Million - Mile Warranty. Bottom line is Borla gives you a lot of reasons to upgrade your six - shooter, from over 13 lighter, more power, more torque, better mileage, lifetime warranty, exciting look and legendary Borla growl. Old school or new, that's a deal. Borla, the original pioneers of high quality, T - 304 stainless steel (superior to 409 or aluminized steel) free - flow exhaust utilizes patented award and race winning technology to deliver quality, sound, performance gains and enhanced fuel economy all with an easy bolt - on installation and backed by an unsurpassed written Million - Mile Warranty.