I had a problem not long ago, when i installed the short shifter i noticed there wasn't much room to fit it, basically the shifter sat on top of the exhaust, so it was rubbing up against it. When the car was idling you could hear it rattling and when I put the car in 5th or reverse gear you could actually hear it tapping against the exhaust (very annoying) In the end i got it fixed by getting the exhaust moved by cutting it out and mandrel bending the pipe so that it ran around the shifter so it had enough room to play in.