I started this tread in the newbie section and it was suggested I move it into the main section but saw the Q&A section and thought this might be a better place. I just bought a 2006 ZX14 it has a muzzy header and exhaust and the PC3 in it but when I slow down even a little it back fires sometimes quit loud . I know next to nothing about this setup except it is adjustable. I am going to be spending the day on the computer reading up about it. So any help will be appreciated. Now as I got the bike used I don't have the program CD doe's any know where to pick up a copy.