look up d16z6 redline on you tube, epic tuning has a stock internal z6 motor on 28 lbs of boost making 420 h.p. go check it!! and when he turns it past 8500 rpm you can tell he is still making power all stock z6 not a ragged out pos like urs a fresh built motor on stock internals is all. gives you a good look at the engine bay but you have to pause. it can be done and is being done all the time. unfortunately alot of people think you need 2 cams to make that kinda power or fortunately for people like me.cause the build is literally half the price.why are you still on this site just go look at you tube...