This system produced gains of up to 14 HP and 15 lbs. x Ft. TQ., as measured on our in - house dyno. This system is constructed of 1 - 58 IN mandrel - bent 409 stainless steel tubing for maximum strength and durability. Factory style laser cut machined mild steel flanges are used used for a secure leak - free seal. 3 - to - 1 Mitered Merge collectors decrease turbulence and increases exhaust velocity. The result is increased horsepower, torque and improved throttle response. Includes gaskets and lower outlet hardware for a direct bolt - on system. No cutting or modifications required for a hassle - free installation. Utilizing state - of - the - art computer - aided design technology, these headers are designed for custom, high tolerance factory fitment. 100 MIG - Welded for race - proven strength and durability.