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There are a few turbo kits available but attempting to get any more than about 350hp out of an otherwise standard engine will shorten the life of the engine dramatically. I would be factoring in another $10,000 for a complete engine rebuild with stronger internals if 480 to 600hp is your aim.
We have competition Patrols here in Oz with turbo TB48 engines putting out in excess of 600hp but the engines are fully modified not just turboed.