The Shelby GT350 sports the whipple/Ford blower and it is rated at about 7psi with hp ratings of over 550 depending how its tuned. A friend of mine has seen it first hand and talked to the tech guys working with it, they all love the blower setup and say 7psi is safe. The only problem is they go through clutches like cheap brake pads.
I wonder if Shelby used the stock internals or replaced them with something stronger. :?: