Developed and also tuned for the special year of yours, make and also model car. Maximizes exhaust flow for substantial boosts in horsepower, throttle reaction as well as torque. Change out limiting factory exhaust manifolds with free flowing energy functioning. Built from the highest quality T 304 stainless steel. Pick headers with or even without high flow catalytic converters depends on vehicle . CNC laser cut flanges along with mandrel bent tubes. Factory locations for plain set up are makes use o by bolt-on design. Every header possesses the Stainless Works badge tig welded in position. Couple the headers of yours with a Stainless Works Exhaust process for the final growl. The Stainless Works Headers of yours are supported by a tight Lifetime Warranty one 3/4 CNC Mandrel Bent primaries. 3/8 heavy CNC laser therapy cut flanges. two 1/2 y pipe with higher flow cats. Not CARB emission credentialed. Can't be sent to other states in america and California switching to California emission standards. 2004 GMC Sierra Stainless Works Headers...