Question about 2004 GMC Envoy
Yes, legally as well as performance wise. Your vehicle needs the back pressure from the factory exhaust components for the engine to run correctly.
There is no reason to remove the cat, but it is illegal to do so.
Posted on Nov 05, 2012
The catalytic converter must remain in the exhaust system so that the engine can perform properly, and meet emissions standards. The resonator, located at the rear bumper, can be removed without affecting anything. The sound of the exhaust may increase a small amount, and the looks of the rear area will be improved especially if a chrome tip is added to the extension pipe that would replace the resonator.
Posted on Nov 24, 2012
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Posted on Jan 02, 2017
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