hello... I recently got a 2.3" cat back exhaust (not actually sure what brand it is haha, but anyway) for on my EF Fairmont 6 cylinder, and it sounds great, but...

It makes a noise when i go over bumps in the road and some speed bumps....its not the exhaust hitting anything under the car or anything, because ive checked all that, its more like, a grinding sound...I thought perhaps it could be from the join of the new system to the original ford converter? I'm no exhaust expert so if anyone has any ideas I'd be glad to hear them,
thanks

Take it back to where u got it done and show and take the mec that put it on for a drive so he can here it.

muffler grinding on the hump? how low is your car?

Im guessing its pretty low?

my car is just standard....and no its not the muffler hitting anything, because it makes the sound sometimes when i just hit a small pot hole in the road...

my exhaust came loose where the rear section comes out of the big muffler... the bracket had loosened itself (vibrations??) and yeah i had the same prob... it wasnt hittin the ground or the body... just twisting slightly inside the flange...