A cold air intake is an aftermarket assembly of parts used to bring relatively cool air into a car's internal-combustion engine.
The principle behind a cold air intake is that cooler air has a higher density, thus containing more oxygen per volume unit than warmer air.
Some strategies used in designing aftermarket cold air intakes are:
At least those are the idea's. EVERYBODY has their opinion regarding real world benefits.
- Reworking parts of the intake that create turbulence to reduce air resistance.
- Providing a more direct route to the air intake by eliminating muffling devices.
- Shortening the length of the intake.
- Placing the intake duct so as to use the ram-air effect to give positive pressure at speed.