I just ordered an 06 Roush Stage One. I can't seem to find any information on the Roush Supercharger. If you go to their website, it states that it is not street legal. The Ford dealer says that they do install them, and they are legal. The Vortech supercharger is 50 state legal and they claim 480h.p. It appears that the Vortech comes with 39lb. injectors. I wanted to keep it completely Roush, but it is possible that Roush doesn't even manufacture their charger. If someone has info, please let me know. I was trying to stay away from the screw style chargers.