Unleash more torque and horsepower from your Dodge or Chrysler 5.7L with this Twisted Steel series header. Made with 16 - gauge 1 - 34 mandrel bent 304 stainless steel tubing and use 4 to 1 mitered merge collectors to eliminate flow - block turbulence. The result is unrestricted exhaust flow for overall performance gains of up to 9 HP and 10 lbs. x ft. torque on our in - house dyno. 100 hand MIG welded for quality, strength and durability, this system also features ball flange connection, retains factory 02 sensor locations and includes metal gaskets and hardware for hassle - free install. Performance Gains In house dyno testing produced gains of up to 9 horsepower and 10 lbs. x ft. torque. Optimized Tube Lengths Head tube lengths are optimized for true pulse control technology which improves flow and performance. Mitered Collectors 4 - to - 1 mitered merge collectors decrease turbulence and increases exhaust velocity. The result is increased horsepower, torque and improved throttle response. Stainless Steel Construction Mandrel bent 1 - 34 16 - gauge 304 stainless steel tubing increase exhaust velocity for noticeable torque and horsepower gains. Heavy Duty Flanges 38 Thick, 1 - piece flanges prevent warpage to ensure a leak - free seal over the life of the vehicle. MIG - Welded 100 MIG - Welded by certified craftsmen provides the strongest welds reducing stress cracks for race proven strength and durability. Factory Mounting Locations These headers retain your stock catalytic converters and factory 02 sensor locations for a direct bolt - on installation which requires no cutting or modifying. Hassle - Free Installation Factory style metal header gaskets and all necessary hardware are included for a hassle - free installation.