Warm air intake

A warm air intake, or WAI, is a system to increase the amount of air going into a car for the purpose of increasing the power of the internal-combustion engine.

All warm air intakes operate on the principle of increasing the amount of oxygen available for combustion with fuel. Warm air from inside the engine bay is used opposed to air taken from the generally more restrictive stock intake.

It is similar to a cold air intake (CAI), which significantly differs by collecting air from a colder source outside of the engine bay.