For nearly 3 decades, Borla Exhaust has been the choice of Mustang experts, from the Cobra-R SVT Mustang to the new Ford GT. 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. Two axle-back options are available: THIS Aggressive 'S' Style rear exhaust section and a traditional Borla exhaust which is a more mellow rear section ' both replace only the over-the-axel pipes, mufflers and tips. BORLA, the original pioneers of aerospace-grade 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. Unsurpassed written Million-Mile Warranty.