Not trying to be a dick but you should really search there is tons of info here, and "boost it" is to vague. I mean what are your power goals, budget, mechanical experience, and knowledge of the k series. If money is no object and you want around 300 hp i would go with a k24a2, if u want more then build a k24a1 with a k20a2 head etc.... do some searching and ask questions in other threads if they don't answer your question.
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