Example of a Roush cold air intake system installed on a sixth generation Ford MustangIllustration of how the first generation Honda Ridgeline's cold air intake system gets fresh air forward of the radiator and into its airbox using an air channel created by the bulkhead cover and rubber seals under the engine's hood.[1]
A cold air intake (CAI) is usually an aftermarket assembly of parts used to bring relatively cool air into a car's internal-combustion engine.
Most vehicles manufactured from the mid-1970s until the mid-1990s have thermostatic air intake systems that regulate the temperature of the air entering the engine's intake tract, providing warm air when the engine is cold and cold air when the engine is warm to maximize performance, efficiency, and fuel economy. With the advent of advanced emission controls and more advanced fuel injection methods, modern vehicles do not have a thermostatic air intake system and the factory-installed air intake draws unregulated cold air. Aftermarket cold air intake systems are marketed with claims of increased engine efficiency and performance. The putative principle behind a cold air intake is that cooler air has a higher density, thus containing more oxygen per volume unit, than warmer air.
^2006 Honda Ridgeline introduction (part 3 of 4), Ridgeline's Chief Engineer (Gary Flint) introduces the Ridgeline, YouTube, by The Temple of VTEC, posted by Jeff Chambliss on 1 August 2009, last accessed 16 August 2015
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