This all T409 stainless steel exhaust system features a single 3.50 in. mandrel bent pipe throughout, with a full 4.00 in. stainless tip. A 50 Series Big Block muffler provides a muscular sound outside with a moderate interior sound, and the system delivers the performance and mileage gains you expect from Flowmaster products. Proudly made in the USA, this exhaust includes a lifetime limited warranty for long term quality assurance.