I'm coming to the end of modding the car for performance I think for a while. Really all I have left to do is a pulley, smallest that I can run of course. I've got the supporting mods for a 3.4 maybe, depending on how much KR I'd get. Now I'm on the stock pulley/tune and have 0* KR. I'd be getting a pulley for sure in the future, after the Bahammas that is. My main question really is is would an AFC or happy knob be worth it say on a 3.4 pulley? I kinda know what they do but would a good tune be better, and what exactly do they do? I can't tune but there is a shop here in town that has a pretty good rep with dyno tunes, either way its more $$$. Right now I have a K&N open cone(might put the FWI back together), 180* t-stat, AL 104s, front PLOG, 3" catless DP, u-bend delete, reading off of a Racetech Designs scan gauge reading 0* KR.