At formula D this year, I was talking to a guy with a 240sx with a vh45 twin turbo that was close to completion, but not running yet, and he was saying that the drawback of the motor was the small chamber heads, and that it needed a a lot of head work to be efficient with the turbos. I work for nissan and have worked on those motors before. They are very smooth in operation, but leak like bitches. They don't offer hardly any aftermarket as far as cams,pistons, rods, ect., and almost everything is going to have to be custom (EFI, turbo manifolds, ect..) An LS motor, will make more power for the price, and is way easier to swap. Plus, you get the benifit of the t56. LS motor hands down.