this very well may be a very stupid question... but w/ my vortech unit and the different pulley combinations where can i find a quick reference on what size belt to use? i'm going to push about 16lbs, but am on the stock 6 rib... any good places to find an 8 rib set up? or have you not had that bad of belt slippage around 16psi w/ a centri? also, when vortech upgrades an Si to a T trim to they change out the data plate to reflect that or will it still say Si trim? Thanks, -Dylan