I would say that Maxs' car, and to a certain extent Simon Wills car sound so loud is because of the exhaust system that Dynamik/Longhurst Racing are using on there cars. Also its probably not the fuel mixture that makes more black smoke come out of the SBR cars, as it is all the same fuel for everycar, but it probably would have something to do with the fuel configuration or some sort of filter?
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