Class A – Open
(Turbocharged and supercharged allowed; Nitrous Oxide system allowed)

Class B – 2WD Forced Induction
(Only one power adder allowed; 2WD vehicles only)

Class C – 2WD Normally Aspirated
(only naturally aspirated engines allowed; NOS system prohibited)

Class D – 2WD Limited
(engines 1600cc and below; only naturally aspirated engines;
NOS system probihited)

Class E – K-Car
(Engines 1000cc and below; turbo-charged & supercharged engines allowed;
NOS probihited)

Class F: Avantech On The Road Class
(Engines 2000cc and below: turbocharged/supercharged probihited;
variable valve engine allowed; NOS probihited; cars must be road legal)

Class G – Campro
(Campro Naturally Aspirated engines; up to 1601cc; suspension, brake system;
engine management; gearbox & ratio free)