The '92-'95 EX/Si should be a 15/16" MC that will bolt right in. The '94+ GS-R (not possitve on all years) 1" ABS MC needs to have one line cut and reflared (you need the fitting to make sure you grab it). I think the Type R's also use a 1" MC that doesn't need any modification. Some of the later ('96+) GS-R's might use the same MC, but I'm not sure. I konw the one I had had to be cut and reflared. Seeya.