AEM 21-2057DK DryFlow 4 in Conical Air Filter 5.75 in Base x 7 in H Universal

Vehicle Fitment

• Universal - fits any cold air intake, short ram intake, or intake tube with a 4.000 in (102mm) outside diameter pipe end
• Suitable as a replacement filter on existing AEM cold air intake systems using 4-inch intake tubing, or as a primary filter element on custom intake builds
• 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 4.000 in flange ID before ordering

Fitment Notes

• The 21-2057DK is a clamp-on universal conical filter, not a vehicle-specific drop-in panel filter. It requires a 4.000 in (102mm) OD intake tube. Secure with a standard hose clamp (not included) over the 0.938 in flange length.
• Filter dimensions: 5.750 in OD base tapering to 4.750 in OD at the top, 7.000 in height. Confirm available under-hood clearance for the full 7-inch filter body before installation - the 4-inch flange and tapered cone profile are common on larger-displacement and higher-performance intake builds.
• The flange is centered at 0-degree offset - the filter mounts straight onto the intake pipe with no angular offset. For angled configurations, see other AEM DryFlow universal filter variants.
• 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. The 4-inch clamp-on equivalent in the same 6-inch OD / 7-inch height cylindrical (non-tapered) body is the 21-2058DK.

Features

• Three-Dimensional DryFlow Synthetic Media - Depth Loading with Structural Screen Wire: The 21-2057DK uses AEM's DryFlow non-woven synthetic filter media engineered with both depth loading (contaminants are trapped throughout the full thickness of the media, not just on the surface) and structural screen wire embedded within the filter matrix. This combination increases the filter's effective surface area for contaminant capture, maintains the media's structure under high-airflow conditions, and makes the filter easier to clean than surface-loading filter types.
• Up to 99% Filtration Efficiency - Oil-Free: Delivers high airflow and up to 99% contaminant capture efficiency without requiring filter oil. Unlike oiled cotton-gauze performance filters, DryFlow eliminates MAF sensor contamination risk from oil overspray and does not degrade from repeated cleaning cycles.
• Tapered Conical Profile - 5.75-Inch Base / 4.75-Inch Top / 7-Inch Height: The cone shape tapers from a 5.75-inch base OD to a 4.75-inch top OD across a 7-inch height, providing substantial filter media volume and surface area in a tapered profile that is well suited to 4-inch intake systems on a wide range of engine displacements.
• Reinforced Internal Cage - Lighter and Stronger Than Mesh: The flexible reinforced internal cage resists collapse under engine vacuum and high-airflow conditions while keeping overall filter weight low.
• Urethane Body - Won't Shrink or Crack: Constructed from urethane rather than plastisol-based materials, the filter body maintains its shape and sealing properties through repeated heat cycles and long service life without shrinking or cracking.
• Integrated Velocity Stack in Flange Neck: The 4-inch flange incorporates an integrated velocity stack profile that increases structural rigidity and smooths airflow entry into the filter body for improved overall flow capacity.
• Closed Rubber Top Cap: The closed black rubber top cap seals the filter top and directs all incoming air through the full 7-inch conical media surface, maximizing the effective filtration and flow area of the filter body.
• Flows Well Even When Dirty: AEM's non-woven synthetic media sheds trapped dirt particles under engine vibration, maintaining consistent airflow performance as the filter loads up between cleanings.
• Washable and Reusable - Lifetime Filter: Clean with AEM filter cleaner (PN 1-1000), rinse with water, air dry, and reinstall - no oiling required. Designed to last for the life of the vehicle.
• Will Not Void Vehicle Warranty: The 21-2057DK 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: 21-2057DK
• Brand: AEM Induction Systems
• Product Type: DryFlow Universal Clamp-On Conical Air Filter
• Color: Red (element); black rubber cap
• Filter Shape: Round conical (tapered)
• Filter Material: Non-Woven Synthetic with Structural Screen Wire (DryFlow - oil-free)
• Internal Cage: Flexible reinforced
• Flange Inside Diameter: 4.000 in (102mm) - fits 4-inch OD intake pipe
• Flange Length: 0.938 in (15/16 in)
• Flange Angle: 0 degrees (centered, straight)
• Flange Type: Centered (1 flange)
• Outside Diameter (Base): 5.750 in (146mm)
• Outside Diameter (Top): 4.750 in (121mm)
• Height: 7.000 in (178mm)
• Top Style: Black rubber cap (closed)
• Oiling Required: No
• Washable / Reusable: Yes
• Filtration Efficiency: Up to 99%
• Country of Manufacture: USA
• Warranty: Lifetime Limited
• Quantity: 1 (sold individually)

Included Components

• 1x AEM DryFlow Universal Clamp-On Conical Air Filter (21-2057DK)
• Note: Intake pipe, hose clamp, and heat shield sold separately

Product Description

The AEM 21-2057DK is a universal DryFlow clamp-on conical air filter for 4-inch intake tubing - a tapered cone measuring 5.75 inches at the base, 4.75 inches at the top, and 7 inches tall, with a 4-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 4-inch pipe.

The DryFlow media uses a three-dimensional filtering structure combining depth loading and structural screen wire - trapping contaminants throughout the full media thickness rather than only on the surface, for up to 99% filtration efficiency and a filter that cleans more easily than cotton-gauze or surface-loading alternatives. No filter oil required. The tapered 7-inch body provides substantial filter surface area for strong airflow capacity on performance 4-inch intake systems across a wide range of engine sizes. The reinforced internal cage and urethane body ensure long-term structural integrity.

Fits any 4.000 in (102mm) OD intake tube. Secured with a standard hose clamp over the 0.938 in flange. Washable and reusable for the life of the vehicle. Made in the USA. Backed by AEM's Lifetime Limited Warranty.