Hang on - the 1.4 equivalency factor applied by the ASWMC is more or less universal so don't assume that the ASWMC alone is where you'll find the answer because as you have already suggested the answer is not that simple.
You apply the 1.4 calculation if the car was fitted with forced induction by you or the manufacturer
I might be wrong but to compete without a roll cage and so forth on the face of it restricts you to less modified classes where non standard forced induction may not be allowed
So you have to enter the car in a class for more modified cars
BUT - and this needs checking - surely the relevant point is the car not the class you're running in - in other words if the car is roadgoing etc even if you're entered in the turbo nutter slicks and wings modsports loony class you may not have to have a roll cage.
Anyone know definitively??
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