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Crisis, the sequential twin turbo set up you have mentioned is already available on many road cars, most notably the JZ80 Supra and series 6 RX7. It provides excellent drivability and good power production through the rev range. Try driving a supra in 6th on a motorway and see what I mean! In the RX7 it wasn't set up well though, and as such doesn't work properly.
For drags the fastest jap cars ALL run twin parallel turbos. The secret is the launch RPM, which is why the Skyline GTR is so popular. It can be launched at 9000 RPM with the right clutch (redlines in RH9 club cars are typically around 11500 RPM) meaning there is no need to worry about low end power delivery.
Of course it is total crap to drive the car anywhere, but very fast. I think the record for a street GTR is aound 8 seconds at the moment.
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