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theres a little bracket that extends from the tranny mount to the exhaust that holds it in place. if its broken the exhaust will move around alot and bump against the bumper.
to see if the exhaust is your issue, sit in the car. have one of your buddies push up and tap the exhaust against the rear bumper. the noise is pretty unique.
otherwise maybe its just your trunk tapping. see if those rubber stopper things are worn out.
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