This system is constructed of 3 IN mandrel - bent 409 stainless steel tubing for maximum strength and durability. This system features a high - flow 409 stainless steel muffler, producing a deep sound with minimal drone. Utilizing state - of - the - art computer - aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. 100 MIG welded for race - proven strength and durability