i dont think youll lose any power.there are some really nice gp mufflers out there if you know where to look.jones exhaust makes some with a great core design that flows well,summit sells them in a bunch of different configurations for a fair price.if your interested ive got a few different sets of gp style mufflers on the shelf,some of which i made.including a set of stainless steel packs and a set chambered mufflers....and well just about everything else you can think of.
