Wow dude seriously you haven't done your home work at all, the price also depends if you can do the installation or if your going to have a shop do it for you, Do you really think a 5k headswap can yield you 30hp lol, your body probably can't even tell the difference of 30hp +/-. If done right a stock 4g64 motor with a evo 8 turbo can get you 250-300whp, a evo 8 headswap + evo turbo could get you 300+ if you swap a bigger turbo and forged internals you can get 500+
Read This post #5 have's links to many DOHC build threads:
http://www.club3g.com/forum/rs-gs/13...ch-button.html
If you don't start doing your homework like you should your going to end up blowing your engine.
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