Im thinking about a full out assault


Ive got a standard S2 Exige, which I bought with a stage 2 Lotus Sport exhaust and pipercross/ CF induction kit already fitted.
I really wanted to fit a 2ubular ultra exhaust/ and GT3 panel kit.

How would this fit into the rules/ eligibility for me entering the Road Marques category within the championship? - would the mods that the car came fitted with be allowed, and would the change of exhaust be allowable or not??