Its does it all the time, uneven bumpy road, dips, go over man hole cover, I didnt put the 19s on they were on when I got it they have low profiles on.I gave it a look over today and I think its the wheels not the exhaust.I dont think the ofset right for the car, when I got it I had to replace the front inner splash guards as the wheels had burned threw them with rubbing when on full lock, think I'll pop my 17s on in mornin n see if it stop, if it does I'll have to get my **** in gear n finish refurbin them [emoji2]