The other approach... which may be laughable, is a lot cheaper. Aim to only increase your peak hp by a small amount. That means you can keep your transmission (er well, maybe not - torque increases), keep your afm, keep your injectors, keep your fuel pump, keep your internals, etc etc. But aim so that your power band is as large as possible, and extends as low as is possible. Would give a nice kick when floored from any revs, although you have to push "torques" instead of horsepowers, much like the diesel gangs. Certainly more likely to see success (which I would love to see ) though then aiming for 300hp straight off the bat. Anyway, don't flame me - not my idea, first read it here.