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. Titanium Ceramic Coat finish reduces outside surface temps of headers, reduces engine compartment temps, and increases header efficiency. 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.