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AEM 12-16 Subaru Impreza H4-2.0L Metal Gunmetal Gray Cold Air Intake - aem21-772C import_2022_03_21_012537 3471cc Air Intake Systems::Cold AirAEM 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