Was just in the middle of posting the same thing!! I'll elaborate a little more...
Dan and I happened to be at the shop picking up parts at the same time Friday afternoon. Lonny had just fixed and issue on the turbo car where the computer would not let it pressurize above 6psi.
We went for a spin and all of my horsepower aspirations immediately whent out the window. It's an unmodified turbo SS engine. Perhaps having no exhaust gives you a little extra bit but Id imagine the HP is close to stock around 270ish. It was absolutely insane. First gear launches were all but useless, it bounced off the limiter so fast it was absurd. I grew up riding liter bikes, But I genuinely can't say I've experienced faster acceleration in anything else before.