I just got the GSX and have been looking at Downpipes, catbacks, test pipes, and 02 housings. My delemma is I'm not sure what size I should go with. I was think of doing 3" on everything but then I heard if you go that big on the 02 sensor and downpipe you loose room in your engine bay. I have also been told that a 2.5 inch downpipe and 02 sensor are the best cause the exhaust gases are hotter there and don't expand until it reaches the catback area. I am also looking into different catbacks. I want one with a dual tipe like stock but can't find that. Should I get a 3" or 2.5"? is the 3" that much better? Thanks guys!
