Twin screw, huh...impressive (and pricey) but worth it...if centifugals are a lot like turbos, and roots are poor performers...then twin screw is the way to go

Whipple doesn't seem to make superchargers for any GM cars, do they?
btw. I'm sold on the whole supercharger > turbocharger argument. I'm just trying to learn more about it. And you've all been a big help!