i personally think its junk, worst way to spend money, you have lag like a turbo even tho its really not a turbo, plus they dont feel near as cool as a turbo or super charger, as in the seat in pants difference, if you want no lag and decent gains, go with a supercharger, but if you want big gains, and little to no lag, go with a smaller turbo, ball bearing, that spools fast, and it will beat out that vortech no prob