The 1NZ-FE is the stock motor for the Scion xA & xB. I don't know the development of this engine- specifically the issue of open versus closed-deck- but no matter, really...GReddy already has a turbo kit under development; it should be CARB certified soon.

I'd consider an xB as a second car- and in keeping with that premise, a turbo kit is what I'd prefer, based on my driving style :naughty: and relative cost-effectiveness.