Is it correct that DTHTBs are not allowed in class 2 but are allowed in class3? Why would this be the case if both classes have a limit of 155 bhp? In my ideal world the class limits would more naturally follow the cars as produced by Caterham, past and present. There has obviously been considerable 'power creep' in the classes over the years, which we can see again this year with the R300k trying to 'downsize' itself into class 2/3. 125, 150, 180, 210, and the rest, would be my preferred limits which I think would encourage more people with stock cars to have a go without feeling hopelessly outclassed.