As for the turbo's, it's always a trade-off. The spool time is controlled by the size. So you can size a turbo to spool up really fast, not just at WOT, and get a decent amount of low end power. But the turbo will end up being the choke point up top, and you'll run out of power quickly.
Conversly you can size them larger, and the lag will be horrid, but up top you'll have gobs of power that you probably would be scared to use.
A third option is to go sequential turbo's, a smaller one for low end and to keep lag down, and a larger one to build that top end power. Think Supra TT.
On another note, consider what may be the ultimate production pro-touring car, the M3, and the fact that now they went with a V8, rather than their own twin turbo straight six...
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2002 Corvette Z06
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