The Radical SR8 needs 360hp (i.e. not the 200hp discussed above) to be ca. 30s faster than a standard GT2RS on the NBR - but the Radical is NOT street legal in many European countries again.

I think this is way off topic and also my personal preference has always been for sportscars rather than purpose-built trackcars, but in defense of the facts, the Radical Sr3SL is fully EU Type-Approved and therefore legal in every EU country.