ok....i did the mystery mod back in xmas time....now that weather is better i rolled down my windows and i noticed i have a profound rattle sound coming from the exhaust...i thought i had noticed before but too lazy to roll down window at time....but was wondering if anyone might have an idea to get rid of this annoying rattle that happens in the rpm range between 2900 and 4000 rpms weird to me....anyone have any ideas?????
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