No idea sorry mate, nut I do notice a few of the petrol guys are getting supercharger kits nowadays instead of turbo'ing, not sure why but might be worth a look?
had a quick google for supercharger kits in usa, more than likely be pretty straight forward.
i almost bought an '04 sr5 v6 before the d40 and the plan was to supercharge it. work commitments led me towards the turbo diesel and for what you'd pay for a good 2nd hand '04 sr5 i was heaps better off with the nav. couldn't entertain the thought of a current hilux, ugly as sin and overpriced to the hilt.