AEM 21-209DK DryFlow 6 in Conical Air Filter 7.5 in Base x 5.25 in H Universal

Vehicle Fitment

• Universal - fits any cold air intake, short ram intake, or intake tube with a 6.000 in (152mm) outside diameter pipe end
• Designed for large-displacement high-performance engines, diesel builds, and custom intake systems using 6-inch diameter intake tubing - one of the largest flange-size DryFlow clamp-on filters in AEM's standard lineup
• 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 6.000 in flange ID before ordering

Fitment Notes

• The 21-209DK is a clamp-on universal conical filter, not a vehicle-specific drop-in panel filter. It requires a 6.000 in (152mm) OD intake tube. Secure with a standard hose clamp (not included) over the 1.000 in flange length.
• The 7.5-inch base OD is the widest in AEM's standard DryFlow clamp-on conical range - ensure adequate under-hood, airbox enclosure, or chassis clearance for the full 7.5-inch base diameter and 5.25-inch height before installation.
• The 6-inch inlet is used on the largest high-flow intake systems for big-block V8 engines, diesel performance trucks, and custom fabricated intake manifolds or throttle body adapters where maximum airflow capacity is paramount.
• For a taller body with the same 6-inch flange, see the AEM 21-2100DK (6-inch flange / 8.125-inch height / 7.5-inch base). The 21-209DK is the compact 5.25-inch height variant.

Features

• AEM DryFlow Oil-Free Synthetic Media - Up to 99% Filtration Efficiency: The 21-209DK uses AEM's DryFlow non-woven synthetic filter media, delivering high airflow and up to 99% contaminant capture efficiency without requiring filter oil. 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.
• 6-Inch Flange - Maximum Flow for Large-Diameter Intake Systems: The 6-inch inlet flange is one of the largest available in any performance air filter brand's standard clamp-on lineup, sized for the most demanding high-displacement and high-flow intake applications. The wide 6-inch opening minimizes inlet restriction for engines and intake systems where maximizing air volume is the primary objective.
• 7.5-Inch Base OD - Exceptional Filter Surface Area: The wide 7.5-inch base OD provides a very large filter media surface area even within the compact 5.25-inch height, keeping intake restriction extremely low at the highest flow rates demanded by large-displacement and high-boost performance engines.
• Aggressive Taper - 7.5-Inch Base to 4.75-Inch Top: The pronounced taper from 7.5-inch base to 4.75-inch top across 5.25 inches of height maximizes the available filter media area while maintaining a compact overall profile - providing more surface area than a straight cylindrical filter of equivalent inlet size in a footprint that can fit in more locations.
• Reinforced Internal Cage - Lighter and Stronger Than Mesh: The flexible reinforced internal cage resists collapse under the high engine vacuum and airflow conditions generated by large-displacement and high-performance engines, 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 heat cycling and long service life.
• Integrated Velocity Stack in Flange Neck: The 6-inch flange incorporates an integrated velocity stack profile that smooths and accelerates airflow entry into the filter body, increasing structural rigidity while improving overall flow capacity.
• Closed Rubber Top Cap: The closed top cap directs all incoming air through the full tapered conical media surface, maximizing the effective filter area and airflow capacity across the 7.5-inch base body.
• Washable and Reusable: Clean with AEM filter cleaner (PN 1-1000), rinse with water, air dry, and reinstall - no oiling required.
• Made in the USA: Manufactured by AEM Induction Systems to precision quality standards.

Specifications

• Part Number: 21-209DK
• Brand: AEM Induction Systems
• Product Type: DryFlow Universal Clamp-On Conical Air Filter
• Color: Red
• Filter Shape: Round conical (tapered)
• Filter Material: Non-Woven Synthetic (DryFlow - oil-free)
• Internal Cage: Flexible reinforced
• Flange Inside Diameter: 6.000 in (152mm) - fits 6-inch OD intake pipe
• Flange Length: 1.000 in
• Flange Angle: 0 degrees (centered, straight)
• Flange Type: Centered (1 flange)
• Outside Diameter (Base): 7.500 in (191mm)
• Outside Diameter (Top): 4.750 in (121mm)
• Height: 5.250 in (133mm)
• Top Style: Closed rubber cap
• Oiling Required: No
• Washable / Reusable: Yes
• Filtration Efficiency: Up to 99%
• Country of Manufacture: USA
• Warranty: 1 Year Limited
• Quantity: 1 (sold individually)

Included Components

• 1x AEM DryFlow Universal Clamp-On Conical Air Filter (21-209DK) - Red
• Note: Intake pipe, hose clamp, and heat shield sold separately

Product Description

The AEM 21-209DK is a universal DryFlow clamp-on conical air filter for 6-inch intake tubing - a 7.5-inch base, 5.25-inch tall tapered cone with a 6-inch centered inlet flange. It is one of the largest-inlet standard DryFlow clamp-on filters in AEM's lineup, designed for big-block V8 engines, diesel performance trucks, and any custom intake build where 6-inch diameter tubing is used and maximizing intake air volume is the priority.

The pronounced taper from 7.5-inch base to 4.75-inch top provides an exceptionally large filter surface area in a compact 5.25-inch height - minimizing intake restriction at the highest flow rates demanded by large-displacement and high-performance engines. 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 reinforced internal cage and urethane body ensure long-term structural integrity across the filter's service life.

Fits any 6.000 in (152mm) OD intake tube. Secured with a standard hose clamp over the 1.000 in flange. Some adaptation may be required. Washable and reusable. Made in the USA. 1-year limited warranty.