I have had really good results with the Dragon Fire belt{ the one w/the bigger cogs]. I installed the white spring, Big Gun mufler, Dobeck, under hood K&N filter & SP700 ECU. With the SP700 belt there was alot of slippage when it got hot. I can feel a good bit of differance. I can actually feel a constant pull from off idle till I hit the rev limiter. It may not be the belt for everyone but it has worked great for me so far. I think I'll try a cluth kit then the MUD BUSTER cam, when the budget allows.