Canadian Touring Car Championship esque format.
CTCC has a multiclass touring car championship; all running at the same time.
Classes and cars go (in order of most powerful to least powerful):
Super Class
Civic, Genesis, FRS, WRX, RSX, Accord, 330i, Tiburon/Tuscani, tC, Mazdaspeed3, Solstice, CSX
Touring Class
Civic, Cooper S, tC, Corolla, RX8
B-Spec class:
Fit/Jazz, Mazda 2
Of course we can change the car list to suit our needs but I see this as a great way to combine series together. Super Class would be the normal BTCC/TCC cars, Touring would be sorta the same but less powerful and B-Spec would be wobble box type cars