These are the 4 classes for MINIs for the ‘09 Assault of the flats.
Class 1. Stock MINI (non s) models
Allowed modifications are a cold air intake and an aftermarket exhaust.
Class 2. Modified MINIs (non S) models
Any mods other than those listed above such as header, cam, injectors, etc.
Class 3. Production MINI Cooper S
Mods allowed are cold air intake, exhaust, and supercharger pulley up to 15%
Class 4. Modified MINI Cooper S
Anything beyond class 3 mods such as cam, header, injectors, custom intercoolers, etc.
All classes may use any tires and wheels, any suspension mods, bigger brakes, etc. as these have no bearing on the straight line runs we’ll be making.