Basically you just cut the pipe right before the resonator, and it should come right off. After that you can either weld a new one on (which I wouldn't), put on a extra bit of pipe, or nothing. Mine was ruined, and after I took it off everything was great. It sounds nice when you rev it, but isn't loud or obnoxious otherwise.
Theodore reosevelt
There are 2 bolts on the left side of the resonator.
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Along the top of the motor under the 6 coil pack covers. Remove the hold down bolts and lift them off to reveal the plugs. You must first remove the resonator box from the top of the motor (It says Vortec 4200 on top of it) www.trailvoy.com
the plugs are located under your resonator. the resonator is the black box resting on top of the engine and it says 4.2 on it. it is connected to ur intake. u have to loosen the hose clamps on both sides and un screw the two bolts and after un screwing the two bolts u are able to remove resonator. after removing resonator u will see a line of COPS (Coil Over Packs) u must un bolt ech bolt on that then it will pop up and u can look straitgh down in to the spark plug.
one word: nasty.
its in the driver side above the valve covers. youre going to have to remove the top resonator to get to it. if you remove the resonator you cant miss it... its about in the center above the vavlve cover
Along the top of the motor covered by individual coil packs. Careful removal of the coil pack retaining bolts is a must as they are long and thin. You must remove the resonator box from the top of the motor area (Vortec4200) in order to see what you need to see.
To remove the cover box to get to the fuel injector on the 2002 Envoy, first remove the intake manifold and the valve cover. You can do this by loosening the four bolts that hold the intake manifold first.Ê
Simply unscrew the air intake hose from the resonator box. Then look on all 4 sides of the resonator for some bolts. Use a ratchet with an extension to unscrew the bolts, and it pops right off. Did it on my trailblazer to change thee spark plugs (located underneath the resonator box). Hope this helps!
http://www.cardomain.com/ride/731216/2