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AEM 04-06 Mazda 3 2.3L Red Cold Air Intake - aem21-488R missing-image 6651cc Suspension::Air Suspension Kits 2015AEM pioneered the Cold Air induction system for sport compact cars in 1994. A Cold Air intake system relocates the filter outside of the engine compartment to deliver the coolest air inlet temperatures possible. Cooler air carries more oxygen, which translates into a more intense explosion in the combustion chamber to create more horesepower and torque. But that's only part of the power equation. Tuning the inlet pipe in length and diameter to match