Quote Originally Posted by USonuMabeaCh View Post
I forgot to mention a 160º thermostat, but I honestly think that should be a given, along with valve springs if someone says anything regarding valve-train.

I was hopin to get an informed enough opinion to only have to buy 1 pulley one time and just be done with it, heh. Most of the packages I've seen on the various websites (intense, zzp, 3800) and what I read here have me almost convinced a 3.25 would be should be fine, but I'd rather measure twice and cut once.
here is my opinion: I have an XP cam, ported heads, a full size intercooler and am running a 3.25" pulley. my car has kr when I go smaller. you will not be able to just buy one pulley and call it good, unless you are will to settle with a 3.5". you could probably run a 3.25" pulley if you did the headers 1.9 rockers and a methanol injection, but again tuning will be required.