why not use a larger supercharger? I don't know of anyone who sells a larger supercharger kit. With this larger head unit a good fabrication shop could make this work well. Just a a few brackets custom intake, intercooler, and tubing. http://www.superchargersonline.com/p...=WIP-WSC-140RB
Just think this supercharger running 20 psi with a large cam headers tune maybe even e85 you could push 600 hp, if that's not enough add a large turbocharger and tvt's 3.8 engine. They will be making a low compression version for FI engines.