AEM 06-09 Civic Si Polished Cold Air Intake

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  • Manufacturer Part Number: 21-685P
  • $499.99
    Unit price per 


  • WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. PROP65 INFO
The AEM 21-685P Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific Honda Civic SI and Acura ILX models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is relocated to the driver-side wheel well which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable chrome-like finish. This air intake system was developed to accommodate the engine's factory emissions control devices including the mass air flow sensor, a couple replacement silicone breather hoses as well as a replacement radiator hose. The tapered cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is backed by AEM's Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50 state legal. View the 21-685P vehicle applications to determine the legal status for each vehicle.

This Part Fits:

Year Make Model Submodel
2008 Honda Civic MUGEN Si
2006-2011 Honda Civic Si