AEM 21-9024DP Polished Brute Force HD Intake System AEMs lifetime DRYFLOW Synthetic air filter is up to 99.52% efficient in FINE DUST testing, filters dirt as small as one micron, and never needs filter oil! Engineered to produce maximum horsepower and torque Manufactured and assembled in the USA 50-state legal or pending legality - Excluding intake systems that are designated as Off-Road Use Only. Guaranteed for life