k20/k24 as everyone else has said. a normal k20a2 can run about 135kw atw (roughly) with a few bolt on mods (rbc, tb and of course i/h/e) and kpro. if youre worried about the price i say get a k24a3, you can pick them up for roughly $800 nowadays but you will still need a kpro. google it and see what you come up with. SEARCHING IS YOUR BEST FRIEND
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