anyone familiar with the above. I'm in Fl no vehicle inspections. I had a 96 tt and when I changed the system what I did was from the downpipes I just removed the OEM and added the testpipes and the X pipe and mufflers. The 350z had the mufflers changed when I bought it so all I want to do is the rest of the system. Is it worth doing and is it doable with the cats? Thanks