This is the current FWD champs build thread.
http://www.vxronline.co.uk/forum/showthread.php?78127-Time-Attack-Project Think hes at around 360Hp, so ower wise, Steve should annihilate him.
Good news though steve, last year there was a controlled tyre, Pirelli P Zero iirc, which would have been a nightmare with your power id imagine, but this year they are leaving it open with only a few caveats
[pdf]http://www.timeattack.co.uk/downloads/Tyre%20choices%20for%20the%202012%20Time%20Attack%20Championship.pdf[/pdf]
So i think its any tyre within the MSA 1B category for dry, but must be 1B for wet
[pdf]http://www.msauk.org/uploadedfiles/msa_forms/bluebooks/11/191-200%20Permitted%20Tyres.pdf[/pdf]
Im presuming you would enter the club class?