ok my car is running really good and now if im driving it and I floor it and let off the gas before it shifts it will backfire im thinking its going lean on fuel and the car use to run really good with the mid headers now I put LT headers and im having a lot of problems I have 3" LT going into 2"1/4 pipe is it not getting the back pressure please comment so I can try something here is a picture of my exhaust.......