what can i do to a stock engine

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Ouch. Wrong forum my friend. Try posting in the proper area, however; there is a plethora of information in the site. Look around as this topic has been covered quite a few times. Take the time to think about your budget and goals as well. Best of luck to you. :thumbsup:
what motor are you trying to build? and how much power are you trying to get out of it? budget?