I got a 97 GSR and am looking into an 01 ITR catback. I was told that the GSR piping is ~1.8" and the ITR is 2.25". Can anyone confirm this? Anyone with this setup? Satisfied w/ it? Also, will the 01 ITR cat back bolt straight onto my cat and line up correctly with the hangers? Are the dimensions the same or do i need to do some sawing and welding. Let me know whats up .. thanks in advance.