Sounds weird I know but I saw it on Kenny Wayne Shepard's 70 Duster at the Spring Fling. He raved about it and the much improved stopping power. He said it was one of the best improvements he's made to his car. So I did some reading about it and thought I'd give it a try. The vacuum boosters are bulky and don't work so well with radical cams and the hydroboost runs off my power steering. Will see how I like it. I can always remove it and go back to manual disc brakes.