I have a stock mt2 rtr. The t15 engine sucks and wont hold tune, so im thinking of upgrading to the o.s. .18cv-rx w/ rotary carb (i heard it was good). im also thinking of upgrading the clutch bell and the spur gear, but im not sure how many teeth for the clutch bell as well as the spur gear. I wont good top speed as well as good acceleration, that does not limit the capabilities of the engine. also i want to upgrade my tune pipe, is this a good one: http://www2.towerhobbies.com/cgi-bin...&I=LXCPX4&P=&I . If not, whats a good tune pipe