Just was wondering if anyone had no luck from their power plate? Friday I had my car running great, 17 psi on pump gas, no knock. Sat. installed 3" THDP, new V. Springs, Power Plate and $30 worth of 100 octane. Sat night took car out, good bottem end but med and top end just wasn't there. I also got 9 deg. of knock at same boost level. Came home to check to see if down pipe was hitting anything, looks good all the way around. Seems to have at least an inch in the tightest place. I don't think the V.Springs or the pipe is hurting the performance on top end. I'm sure the knock retard is what is hurting me. Don't know why I'd have any knock. What do you guys think? HELP!!!!!