Hummer H3 Long Tube Header System Up to 30HP Gain!
3.5L and 3.7L models are available, constructed of super heavy gauge T304 stainless tubing and 3/8 THICK flanges. Result in great throttle response increase as well as 20-30 horsepower. Removes the factory catalytic. Add computer tuning, a cat back exhaust, and air intake for more GAINS!