i wouldnt go 3l personally the walls are just too thin + you wont gain much at all vortech arnt what your looking for if your after 450 hp mate im running 12 psi and 320 and thats on the limit due to belt slip i know of 1 12v vr6 running 400 hp with a rotrex but i dont know of any1 running a vortech at more than 320 hp the charger will take more boost but the belt tension would have to be stupid