I have an m4 carbon fiber exhaust iv recently ordered a gp exhaust but i have been reading on cutting an the one i have already and if its pretty easy to do then i will return the gp but i need to know what tools to use i heard u could use a dremmel tool but if anyone has done it before plz give advise or step by step would be greatly appreciated i want the unique sound of the custom exhaust heres a pic of mine

 

Do a search i think someone shortend a Jardine dual outlet. Was thinking about doing the same this winter.

 

Here's a couple of write-ups: No.1 & No.2.

 

bench saw or dremel works, just cut it. drill out the old rivets so you can take off the end cap, drill new holes for the rivets, rivet the cap back on and ur good. not hard at all. youtube it bro im sure sum1's made a vid of how to do it, or look in the stunt section, thats who started doing it so you wouldnt hit ur pipe on 12's.