There's a wide range of GMC accessories you can install to give you added horsepower and torque, but if you're really serious about your rig you need to consider performance headers for the GMC C/K 3500. These are a big improvement over the standard GMC C/K 3500 headers most drivers use.
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With the right C/K 3500 exhaust headers you will enjoy a major step up in power. The guys at AutoAnything have loaded us up with fantastic aftermarket gear such as C/K 3500 long tube headers as well as C/K 3500 smog legal headers. Drill down and do a little comparing then get this project going.
Year Range For GMC C/K 3500 Exhaust Headers & Manifolds