I've had my rrm sway bar and magnaflow exhaust for about maybe 3-4 months and I'm starting to hear bad squeaks in the rear. When I start my car, the exhaust shakes and rattles and sounds like the exhaust is loose? And, when I go over any types of bumps, my rear squeaks badly. My car moves up and down also when I go over big bumps, I'm thinking that its the sway bar.

Any tips? suggestions? comments..

 

could be your rear springs...who knows..check your mounts for the exhaust and perches for the sway bar..