AEM 21-2011DK DryFlow 2.5 in Conical Air Filter 5.5 in Base x 5 in H Universal

Vehicle Fitment

• Universal - fits any cold air intake, short ram intake, or intake tube with a 2.500 in (64mm) outside diameter pipe end
• Suitable as a replacement filter on existing AEM cold air intake systems, or as a primary filter element on custom intake builds using 2.5-inch intake tubing
• Compatible with carbureted and fuel-injected engines across gasoline, diesel, and alternative fuel applications
• Some adaptation may be required depending on installation - confirm pipe OD matches the 2.500 in flange ID before ordering

Fitment Notes

• The 21-2011DK is a clamp-on universal conical filter - it is not a vehicle-specific drop-in panel filter. It requires a 2.500 in (64mm) OD intake tube or pipe end. Secure with a standard hose clamp (not included) over the 1.125 in flange length.
• Filter dimensions: 5.500 in OD base tapering to 4.750 in OD at the top, 5.000 in height. Confirm available under-hood clearance for the full 5-inch filter body before installation - the conical profile provides some flexibility in tight engine bays compared to straight cylindrical filters.
• The flange is centered at 0-degree offset - the filter mounts straight onto the intake pipe with no angular offset. For angled or offset flange configurations, see other AEM DryFlow universal filter variants.
• The 2.5-inch inlet is a smaller-diameter filter suited to compact intake systems, smaller-displacement engines, turbocharged applications with 2.5-inch inlet tubing, and BOV or blow-off valve recirculation intakes.
• For replacement filters on AEM cold air intake systems, verify this part number matches the original filter supplied with your specific AEM intake kit before ordering.

Features

• AEM DryFlow Oil-Free Synthetic Media - Up to 99% Filtration Efficiency: The 21-2011DK uses AEM's DryFlow non-woven synthetic filter media to deliver high airflow and up to 99% contaminant capture efficiency without requiring filter oil. Unlike oiled cotton-gauze performance filters, DryFlow eliminates the risk of MAF sensor contamination from oil overspray, and the synthetic media does not degrade from repeated cleaning cycles the way cotton gauze can.
• Tapered Conical Profile - Maximum Filter Media in a Compact Package: The cone shape tapers from a 5.5-inch base OD down to a 4.75-inch top OD across a 5-inch height, providing more filter surface area than a straight cylindrical filter of equivalent height while maintaining a compact footprint that works well in tighter engine bays and smaller intake setups.
• Reinforced Internal Cage - Lighter and Stronger Than Mesh: The internal support structure uses a reinforced cage design that is lighter and structurally stronger than conventional wire mesh cages, resisting collapse under engine vacuum and high-airflow conditions while reducing overall filter weight.
• Urethane Body - Won't Shrink or Crack: The filter body is constructed from urethane rather than plastisol-based compounds, maintaining its shape and sealing properties across the full temperature range of automotive use - it will not shrink over time or crack from heat cycling.
• Integrated Velocity Stack in Flange Neck: The 2.5-inch flange incorporates an integrated velocity stack profile in the inlet neck, improving structural rigidity and smoothing airflow entry into the filter body for improved overall filter flow capacity.
• Closed Rubber Top Cap - Maximizes Filter Surface Area: The closed rubber top cap seals the top of the filter, directing all incoming air through the full conical media surface rather than short-circuiting through an open top, maximizing the effective filtration and airflow area.
• Washable and Reusable - Lifetime Filter: AEM DryFlow universal filters are washable with AEM filter cleaner (PN 1-1000), rinsed with water, air dried, and reinstalled - no oiling required. Designed to last for the life of the vehicle or intake system.
• Will Not Void Vehicle Warranty: The 21-2011DK will not void the OEM manufacturer's vehicle warranty when used as directed.
• Made in the USA: Manufactured by AEM Induction Systems to precision quality standards.

Specifications

• Part Number: 21-2011DK
• Brand: AEM Induction Systems
• Product Type: DryFlow Universal Clamp-On Conical Air Filter
• Filter Shape: Round conical (tapered)
• Filter Material: Non-Woven Synthetic (DryFlow - oil-free)
• Flange Inside Diameter: 2.500 in (64mm) - fits 2.5-inch OD intake pipe
• Flange Length: 1.125 in (1-1/8 in)
• Flange Angle: 0 degrees (centered, straight)
• Flange Type: Centered (1 flange)
• Outside Diameter (Base): 5.500 in (140mm)
• Outside Diameter (Top): 4.750 in (121mm)
• Height: 5.000 in (127mm)
• Top Style: Rubber cap (closed)
• Frame Design: Flexible reinforced internal cage
• Oiling Required: No
• Washable / Reusable: Yes
• Filtration Efficiency: Up to 99%
• Country of Manufacture: USA
• UPC: 024844301178
• Warranty: Lifetime Limited
• Quantity: 1 (sold individually)

Included Components

• 1x AEM DryFlow Universal Clamp-On Conical Air Filter (21-2011DK)
• Note: Intake pipe, hose clamp, and heat shield sold separately

Product Description

The AEM 21-2011DK is a universal DryFlow clamp-on conical air filter for 2.5-inch intake tubing - a tapered cone measuring 5.5 inches at the base, 4.75 inches at the top, and 5 inches tall, with a 2.5-inch centered inlet flange. It is designed for use on custom intake builds, cold air intake systems, or as a direct replacement filter element on existing AEM intakes using 2.5-inch pipe. It is a clamp-on universal filter, not a vehicle-specific drop-in panel filter.

AEM's DryFlow oil-free synthetic media delivers up to 99% filtration efficiency without requiring filter oil - eliminating MAF sensor contamination risk and simplifying maintenance to a wash-and-reinstall cycle. The tapered conical profile delivers more filter surface area in a compact 5-inch height than an equivalent straight cylindrical design, making it well suited to smaller intake systems, compact engine bays, and turbocharged applications with 2.5-inch inlet tubing. The reinforced internal cage, urethane body, and integrated velocity stack in the flange neck provide structural integrity and consistent airflow performance.

Fits any 2.500 in (64mm) OD intake tube. Some adaptation may be required depending on the installation. Secured with a standard hose clamp over the 1.125 in flange. Washable and reusable for the life of the vehicle. Made in the USA. Backed by AEM's Lifetime Limited Warranty.