Redline Motive

AEM Cold Air Intake System Increases Horsepower of 2009 Honda Civic Si

The 2009 Honda Civic Si is a sporty compact car with remarkable style and comfort. Equipped with a high-output 2.0 liter engine, sport-tuned suspension, stability control and roomy interior, the ’09 Civic Si is half racecar and half family car. If that isn’t enough to intrigue you, the impressive gas mileage, kickin’ sound system with steering wheel controls, race-style seating and large trunk make this car a very fun and practical daily driver.

One downfall with the 2009 Civic Si engine is the lack of power at lower RPM’s. AEM has addressed this issue with the release of their AEM Cold Air Intake System 21-685C. The 21-685C was specially designed to fit into the cramped engine compartment while delivering more horsepower. This is accomplished by using a custom aluminum intake tube that lowers restriction and an AEM air filter that is located away from the engine to provide cooler air to the engine.

AEM intake systems are dyno tuned and tested for specific applications. The 21-685C was dyno tested in March 2009, and showed an increase of 6.27 horsepower at 5100 rpm. This intake system comes with a gunmetal gray intake tube and an oversized AEM DRYFLOW air filter (21-203DK). The 21-203DK is a washable oil-free air filter designed for high air flow and great filtration.

AEM 21-685C cold air intakes come with detailed instructions to assist with the installation of the system. The Dyno Chart and vehicle applications for this intake are available on our website

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