and of course choosing the best cilinder & pipe combination is very important, select a cilinder kit which offer good power out of the box so you don't have a headache over how you tune it for more power. then get a pipe that fits the profile of the exhaust port, not all pipes that the factory made for their cilinder kits are matched so you must choose the pipe very well or it will all come to nothing if you buy the wrong pipe.
the transmission come after the engine is set-up & this is where you will spend most of your time fine tuning the combination.