AIR CLEANERS
Optional. If used, air cleaner must be OEM automotive or retain
OEM configuration. Air-cleaner base may be cut or trimmed,
but welding, bolting, riveting, epoxying, or any other form of
fabrication is prohibited. Ram tubes, velocity stacks, or non-stocktype base plates or ducting prohibited. Cooling holes prohibited in
radiator side panels, etc. Factory air cleaners and/or scoops that
fit through hood must be affixed to carburetor as per OEM only.

EXHAUST SYSTEM
Optional. Adaptor plates, port plates, and header plates
prohibited. Pan evacuation systems prohibited. Turbo
applications, aftermarket header permitted – turbo must be
located in engine compartment. Mufflers and/or maximum
decibel levels may be enforced at certain facilities, according to
any local ordinances that may be in effect. Contact individual
tracks for more information. See General Regulations 1:3.

FAN, GENERATOR, WATER PUMP
Alternator or generator must be engine-driven and functioning.
Belt must be tight enough to drive equipment in a satisfactory
manner without excessive or noticeable slippage. May be
relocated. Aftermarket pulleys permitted. Electrically driven fans
and water pumps permitted. Water pump must bolt on, with no
modifications to block. Use of “smog pump” or air pump for
crankcase evacuation prohibited.