I think anything goes - the regs say Britcar 2003
Classes:-
Britcar 4 1800-2000cc
Britcar 3 2000-2800cc
Britcar 2 2800-3600cc
Britcar 2 MARCOS MANTIS CHALLENGE
Britcar 1 over 3600cc-5500cc
GT3+GTO+GRPA+
1800-2000cc 900kg
2000-2800cc 1100kg
2800-3600cc 1200kg
3700-5500cc 1300kg
all cars have to be within +or-10% of these figures...
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