Billy Boats's B6 Passat cat-back exhaust is a stainless steel mandrel bent system. Billy Boats's exhaust systems begins after the factory catalytic converter with a 3" pipe and continues back to the BB muffler. 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-machined hangers, you will not find a higher quality system on the market.