Hubraum
This is a class similar to the SP2 GT3-A category and it is reserved for FIA GT4-spec vehicles. There are performance balancing measures enforced by the racing organizers to balance out the field in the class. Depending on the Engine displacement of the vehicle an entrant will be assigned a minimum weight limit of either 750 kg or 1,200 kg and also a fuel tank capacity limit of either 120 litres or 100 litres.