Borla(r), the original pioneers of premium, high-quality T- 304 austenitic 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. Best of all, each system come with the unsurpassed Borla(r) Million-Mile Warranty.