Tech, it's funny you bring that up. This is a new craze in the diesel world. Guys have been putting them on 5.9 cummins engines with a large turbo. The supercharger will run around 3-5psi just above idle. Once the super is over a certain pressure, they waste gate around it and run off the turbo. I actually have a few I was watching on ebay that I thought about giving a whirl. I won't do it until the truck is together first. Haha