Can anyone useing this system and who knows what year zx14 it came off check the diameter of their mid pipe Thanks.
I was going to measure this for you this morning, but saw the bike as I walked out to the garage, and got side tracked (took off riding!).
I can measure this for you tonight, but if all you need to do is determine if yours is 2007 and older ZX, or 2008 and newer ZX, compare it to the stock C14 mid-pipe (if you have one). The C14 is the same size as the 2008 and newer ZX14.
Or like jimmymac just posted while I was typing this, look for the Cat. In the '07 and earlier, it was in the mufflers. '08 and later, in the header.