I have a Cougar 22 MTR about to put an Imco SC Extreme drive -3 on it and hope for the best. The B 1 I have now is +5 X factor so I can't go wrong with -3 for sure. I am also having cone clutch slippage at high RPM I am pretty sure. Hope to get it sorted. The boat had a 500 EFI 1999 Blue Mercury Racing engine with 150-145 compression between all cylinders cold with about 350 hours on it. Love the boat, lots of fun, my first cat after many V and mod V's since I was 11. I am 49 now. I like this site, looks like a cool place to be yourself unlike some of the stuffy other places on the net.