I have a single in duual out flowmaster 40 series and one of my pipes rusted through at the muffler and my wife drug it home that way.my question is with the exhaust half dumped and one side going out the back is the back pressure all screwed up?i drove it today for the first time since and no power threw all rpm range.Im going to cut the other side off this weekend and wait till warmer to have new duals ran out.anybody seen this?