I have been having a problem with the way my truck is running. I had a Flowmaster exhaust system put on my truck, and after backing into a ditch, the hangers broke on the drive's side. I've had the doughnut gasket replaced twice. When I accelerate or turn to the right real sharp, the truck makes a chattering sound on the drivers side of the truck. Could the exhaust not lining up perfect cause my truck to run rough. I've been told that the exhaust has to be perfect. Any help is greatly appreciated. I drive a 77 F150.