Hi mate i didn't quit get 500 but did make 488 on a stock internal neo engine so if it really what you want to do dont be scared off doing it, certainly didnt cost me 25k more like 6 -7 there abouts. But my enging only lasted about 9 - 10 months at that level so i would most definatly recomend setting up a nice forged bottom end with the right choice of mods and you will make it easy as.