Hey, i own a old kawasaki zx6 d3 92.
I just found a cheap slip on exhaust muffler-thingy, the only problem is that it's just compatible with 98-02 models, are there different diameters on the exhausts of newer and older zx6's?

the name of the slip on:

Urban twin port slip-on zx6r 98-02

will it fit my bike? if not, can i make it fit?

 

from what I noticed so far on slip on cans. The inlet diameter and how it mounts to the existing midpipe diameter, the mount of the can to the rear set or other bracket, the total length of the can. The diameter and shape of the can is good to know as you mentioned.