There are classes for cars that were formerly Road saloons, but they are allowed further modifications to their bodywork and interior trim, and all use treaded tyres. Engine and suspension tuning remains unrestricted but the cars now compete in 3 classes according to engine capacity. These are non turbo / supercharged 0-1600cc, 1600-2000cc, and over 2000cc plus turbo / supercharged engined cars. There is also a class for modified saloon cars using turbo or non turbo engines with a virtually free hand in modifications allowed, running on slick racing tyres.
Sports cars run in both the treaded and slick tyre divisions, in the same clases as saloons and competing against them, but the cars must be production based though any amount of tuning is allowed. There are seperate classes for kit cars and Caterhams.
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