3 409 Stainless Steel Construction This axle - back exhaust system is constructed of 3 mandrel - bent 409 stainless steel tubing for maximum strength and durability. Aggressive Sound This system produces an aggressive sound unleashing all available horsepower and torque. Installation Some cutting may be required, see instruction sheet for further information. Utilizing factory style hangers this system mounts directly to factory mounting locations for a hassle - free installation. Computer - Aided Design Utilizing state - of - the - art computer - aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. MIG - Welded 100 MIG - Welded for race - proven strength and durability.