slp lm1/lm2 rattle
#3
Staging Lane
It might be resting on the panhard bar... mine did that. Hopefully you didn't over-tighten the clamps and you can still loosen them up and manipulate the piping to where it won't rub. Good luck!
#5
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Mine does the same at about 4 or 5 certain rpms and at idle on cold starts. It's because the catback got ripped off of the rubber suspender when it was coming down from the tow truck, so the left pipe is loose. Never got around to fixing it because the new exhaust is on the way.