yep, this pulley debate will never end...Slk...I did a 0-160 run with the C3, without a tune. in 9/10ths of a mile, just info.....haven't repeated it since the tune though...but my facination is watching everyone's mods, and times...if you run slicks, you gain a little, mani's, you gain a little...I think you just do the mods that make you happy for what you will use the car for....but for all out racing, drag racing I should say, you have to do what will gain you every 1/10th of a second...and that gets expensive....I will be happy to just get to the low 12's...but if I wanted to chase the 11's, I certainly could with more $$$$