I guess it depends on how quick you want it to be. I think just putting a 3S-GE in there would probably get it going plenty fast enough. The more recent ones have 140 odd kW and for a car weighing (at a guess) 1100kgs that should give a pretyt good power to weight ratio. I'd think it would also be easier to install because you wouldn't ahve to worry about all the turbo piping etc.