nah, this "rattle" occurs over tiny bumps, any type of speed bumps.. Everything in the back is good.. I do brakes my self so i know everything back there is tight. Not the muffler rattling. When i brought the car to him about the lower intake leak i asked him about the rear... he told me that my "rear strut plates" were bad... Maybe he meant shock mounts? Car has 127,500 on it.... Shocks never replaced.... When i go over a bump small/large it squeeks and then rattles ( still tight but rattles as if the shock is just moving around in the hole) so Im thinking maybe even the bushings at the shock ends went. Plus it doesnt help that I live in a Snow area and the salt eats everything lol.