Ok, I found a used 3000 stall lockup torque converter for sale with 3500 miles on it. After seeing this, I am beginning to wonder if I should spend all my money on this torque converter or what I had originally planned which was pullies, timing adjuster, accufab plenum/tb. My question is, what's the difference between lockup and non-lockup, and single disc and multi disc? My car only had a magnapack cat-back and a prochamber, and all I can afford right now is either the converter or the power mods. Which route do you think I should take? Eventually (due to Christmas and my birthday) I will be adding possibly those mods with some minor suspension work. Keep in mind though, this is my daily driver (when not driving my beater) and only sees the track about once a month.