Borla(r) Performance Industries offers a slick bolt-on performance upgrade for the popular 2005-2009 Ford Mustang V6 4.0L. Borla(r) 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(r) for their street and race cars includes Roush Gentilozzi Steeda Saleen Maffucci Mihovetz Bondurant and Shelby. Borla(r) 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(r) embossed bright chrome on T-304 stainless steel tip. As usual the Borla(r) 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(r) backs up this and all their street car exhausts with an industry leading no-strings Million-Mile Warranty. Bottom line is Borla(r) gives you a lot of reasons to upgrade your six-shooter from over 1/3 lighter more power more torque better mileage lifetime warranty exciting look and legendary Borla(r) growl. Old school or new that's a deal. Borla(r) 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.