Ok going to make an under tunnel exhaust. Was lookin at the stock setup and the header pipe or mid pipe whatever you want to call it is tipped up then the muffler is slipped on. What is everyone doing with this tip up? Are you guys cutting the mid pipe back some or having a pipe bent that tips back down. Any ideas would be great. Also anyone know exactly what sport bike mufflers work? Looking for same ID as the stock OD so it just slips on. Or is there more modifaction needing to be done.