You can run on race fuel in the pro class ..It is the club class that you cant..
Pro regs
4.3. Vehicles must run on unleaded fuel. It is permitted to use a higher octane rated fuel, or raise the octane rating of pump fuel ..
Club regs
4.3. Vehicles must run on pump fuel as available from filling stations, no exotic fuels will be permitted although the addition of Octane is allowed..
The Pro regs are spot on bar the outside boot access ...In the UK this is a rule only if you have swirl pot on pumps in the boot ,i will be quirying this..
Philip.