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I might take it to a muffler shop and see if they can pinpoint the issue. I feel like everything was installed well, and all the bolts seem tight. The car only has 17,000 miles, so surely the sensors aren't failing? Is it possible for anything to be too tight? I noticed aFe sold a catted downpipe, does anyone know anything about it? Sorry for all of the questions, I just recently started modding so this is all new to me.
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