Top Gear tested the Prodrive P2 concept on a recent episode... a car that will never and can never go into production. Why not?
First, Prodrive is not in the production business. This is an example of their engineering capability but without production capability and capacity (and investors) the idea of a production P2 is impossible.
Secondly, and even more impossible to overcome, is the "anti-lag" system in the turbocharger. In order to reduce lag, fuel is directly injected into the turbo housing to generate enough volume to keep the impeller spinning. Injecting "raw" fuel into the housing is certainly incompatible with emisisons requirements... as shown by the flame that exits the rear of the P2 at every shift. This is the same system used in WRC cars.
So enjoy it while you can... vicariously thru TopGears test. http://www.bbc.co.uk/topgear/thisweek.shtml Note that the car didn't do all that well with the Stig... but it is just a concept.
And, thanks to YouTube, you can see the full test: http://www.youtube.com/watch?v=b0hDqlASKHc