These systems replace or modify the OEM intake opening to allow more air into the engine—usually with a conical filter and a larger-diameter pipe. The goal is to reduce airflow restriction, allowing your turbocharged engine to "breathe" better for slight gains in horsepower and throttle response.
Swapping from a plastic-enclosed airbox to an open or metal/cold-air style intake produces a louder, more aggressive intake noise—especially noticeable under throttle pull. The intake resonator or silencer is often removed, making the car sound snappier.
High-end CAI kits are designed to draw cooler, higher-pressure air from outside the engine bay—known as ram-air. Cooler air is denser (more oxygen per volume), improving combustion efficiency and often resulting in small power gains.
OEM intake setups often include a resonance chamber or silencer box to reduce intake noise and smooth airflow pulses. Many aftermarket kits remove these for sound and performance, though some high-end designs may include tunable or variable resonance control via valves.
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