There is a baffle in the muffler that is making the poping sound, somthing to do with how it is welded to the inside of the muffler. There is a TSB on this from GM. My dealer changed out my muffler twice and I still had the noise. So I went and installed a Flowmaster muffler on it, no poping now and it sounds great! BIG-C

White 03-H2-LUX

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