Yeah, but I think the point is twofold. First, you have the reliability of a NA V8 that makes 400 *streetable* HP. Then it's made with mostly Hayabusa parts and designed such that many of them will bolt on for more performance (such as cams, which then take you more into the "race motor" side of the world). You also can still turbocharge, and I'd have to think you can get this puppy to 600HP, anyway. That's pretty incredible for something that'll still be 250 pounds even with the additional turbocharger(s).
Think of it more as a platform. Sure, for most people just doing a turbo on a stock Hayabusa engine makes a certain amount of sense. But if you want that V8 sound and more reliability, well, you gotta pay.
--Donnie