Most of the road 2-11 seem to be a similar spec, and need only minor work to make for basic race ready.
This seems typical of whats available http://www.pistonheads.co.uk/sales/988129.htm
On top of that you will need basic safty stuff, extigusher etc., a motorsport wing and front splitter, and the 260 ECU upgrade, also I have also gone for the bigger front discs and mine had a LSD option fitted. (which mean +10kg on min weight)
But the car should remain quite usable for the road/track days