if i had a penny.....
basically in the world of 2 stroke rc car engines it goes thusly:
bigger= more torque, less revs
smaller=less torque more revs
notice how i didnt use the word power?
if you want a good engine, buy a good engine. i am by no means slating that engine or indeed any large engines. think of an f1 car compared to a dodge charger. going by engine size alone surely the charger will win everything. but obviously this is not the case. and the reason why is exactly the same, design and manufacture.
if you feel like more torque, gutsy low-end wheelspin but with a not too impressive top end [in relative terms] then by all means go for the force. but tbh, there's so much gain to be had sticking to what you have. i find posts about power amusing, simply because asides from me baja, i have never had an rc that genuinly warrented more power. in the words of a wise man i know 'it can drive faster than you can control it, it doesnt need to go faster'