AEM Dryflow Synthetic Air Filter - P/N: 21-203DK Product Model: AEM-21-203DK 3.0" DRYFLOW AIR FILTER. SHORT NECK 5'' ELEMENT AEM is proud to introduce the first aftermarket performance air filter that filters at 99.4% efficiency, is cleanable and reusable, does not degrade with cleaning, and never requires oiling to trap dirt and particulates. The DRYFLOW is included in EVERY AEM and BRUTE FORCE intake system. * Never requires oiling during cleaning * No chance of over-oiling filter, takes the guesswork out of servicing * Reduce cleaning time from hours to minutes * No oil - No mess * Bullet-proof construction * Virtually no degradation with repeated cleaning * No wire mesh allows filter to take abuse and not incur damage* * 99.53% Cumulative Filtration Efficiency as small as 1 Micron! * Tested with SAE Fine Test Dust- much smaller than coarse dust * Incredible dust holding capacity means more time between cleanings * Far outflows your engine's requirements * Integrated velocity stack improves airflow