[JGrossijr]

General Regulations section 21 page 5
1:5 Fuel Systems:

"Fuel/Air: Any method of artificially cooling or heating fuel prohibited (i.e., cool cans, Freon, wet rags, etc.), except as noted in Class Requirements. Cool cans, wet towels, etc. are permitted in Super Stock, Stock, Super Comp, Super Gas, Super Street, and E.T. classes. Wet towels, rags, ice, etc. must be removed before vehicle leaves staging area. Coolers, chillers, etc., where permitted by class requirements, are prohibited outside of the competitor?s pit. Ambient-temperature air only; cooling or otherwise changing the conditions of the intake air is prohibited. Spraying of intake with any artificial spray or coolant prohibited."