http://www3.towerhobbies.com/cgi-bin...&I=LXKYU8&P=ML This is probably your best direct replacement engine choice.. By the way it's only going to be a matter of time before you do the FOC. Especially with added power, it will ruin the tranny even with the stock engine. With the FOC kit your tranny is much much stronger and your able to accelerate faster. If you go with a larger clutch bell I suggest only one or two teeth with the stock engine. You will loose some low end grunt..