If you plan on putting on either of those boxes you best be callin Southbend for a clutch now. I had to replace mine and am only making 300HP at the rears. I don't forsee good things for the stock clutch unless you pussy foot it around all the time. I had issues only under hard acceleration when boost spiked up. The "Crazy Larry" box is supposed to be good for what? 240HP? That is crazy on stock parts. Best be getting a boost, pyro, and fuel gauges too.