just build up your F23 (if u got one) let's say u're stock 150 like me, n/a that bastard to 200, boost at 14.7psi and u double your hp...bam, 400hp, dunno how much it will cost, but that's my plan lol hell, make sure the engine is strong enough to handle it and just dial the boost up to 22psi and make 500+