if I remember right somewhere in the instructions its tells you the point to measure and cut on the downpipe but not quite sure though mines a mega so I used all the pieces
ok then well whats the exact difference in length from a short bed to long bed cut off that much and you should be set. Not sure off the top of my head exactly what it is so wont even guessyea the instructions dont say anything where it does talk about cutting downpipe thats for the cat.