I am running an On3 3" open down pipe right now but will be getting a single exhaust made within the next few weeks hopefully. My question is, does an open DP make your car seem like it's running bad? I have some popping when I let off from a WOT pull and the car feels like it may have a small miss. Also the interior is vibrating pretty badly and the DP isn't touching anywhere. Just wondering if anybody else had experience with an open DP and thought their car ran bad too.