APR's A3 Exhaust is a stainless steel, 3.0" mandrel bent, cat-back exhaust. This exhaust is very quiet and simply changes the tone of the exhaust to a deep, unobtrusive sound. With TIG welding, fully stainless construction, and CNC'ed hangers, you will not find a higher quality system on the market. All APR exhausts come with a full lifetime warranty.