IMHO a modded engine is a waste of money. If you know what you're doing, you can get more than enough power from a stock engine. Most stock engines nowadays have too much power for buggies as it is anyway.. "High strung" bla bla.. High price, high maintenance.. If you want to spend big, get an OS Speed.. That seems to be what most people end up getting anyway, after fleeting dalliances with the modding fad...