RE: Stinger length - is it important?
Are you talking about the pipe/muffler itself or the little round piece that exits the exhaust out of the pipe/muffler? Some people call the exhaust pipes/mufflers stingers which is why I ask.
If it is just the little pipe that comes out of the main pipe it shouldn't make that much of a difference on how long it is. If it is the actual exhaust pipe that you are talking about then cutting it will greatly influence the characteristics of the pipe.
rolland