AEM 21-203BF Brute Force DryFlow 3 in Conical Air Filter 6 in Base x 5 in H

Vehicle Fitment

• Universal - fits any cold air intake, short ram intake, or intake tube with a 3.000 in (76mm) outside diameter pipe end
• Designed for off-road vehicles, race cars, UTV/ATV applications, and any build operating in dusty, harsh, or high-demand environments where extra filter media durability and dirt-holding capacity are required
• 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 3.000 in flange ID before ordering

Fitment Notes

• Off-Road / Race Use Only - NOT CARB Compliant. The AEM Brute Force DryFlow filter is not legal for installation or use on emissions-controlled vehicles registered in California or other states that have adopted CARB standards (including New York and Maine). It is intended for off-road, competition, and racing applications only.
• The 21-203BF is a clamp-on universal conical filter - it is not a vehicle-specific drop-in panel filter. It requires a 3.000 in (76mm) OD intake tube. Secure with a standard hose clamp (not included) over the 1.625 in flange length.
• Filter dimensions: 6.000 in OD base tapering to 5.125 in OD at the top, 5.125 in height. Confirm under-hood or cage/chassis clearance before installation.
• The Brute Force line uses a heavier-duty filter media and a mineral-reinforced plastic cage, making it dimensionally and physically distinct from AEM's standard DryFlow filters despite sharing the same flange size. The 3-inch standard DryFlow equivalent is the 21-2031D-HK (red) or 21-2031DK (black).

Features

• Brute Force Heavy-Duty DryFlow Media - Built for Harsh Environments: The 21-203BF uses AEM's Brute Force-specific filter media - a tougher, more durable synthetic material than the standard DryFlow filter media, engineered to withstand harsh, dusty off-road conditions, repeated high-stress cleanings, and demanding racing environments without degrading or losing its structural integrity.
• Mineral-Reinforced Plastic Cage - Collapse-Proof Under High Airflow: Unlike the flexible cage used in standard DryFlow filters, the Brute Force uses a special lightweight mineral-reinforced plastic cage that maintains the filter element's shape and structural integrity even under the high-vacuum, high-airflow demands of large displacement engines and forced induction applications - preventing the filter element from collapsing inward under extreme flow rates.
• Outstanding Filtration Efficiency and Dirt-Holding Capacity: The Brute Force media is engineered for higher dirt-holding capacity than standard performance filters, maintaining effective filtration longer between cleanings in the heavy dust and debris loading typical of off-road, desert racing, and construction-site environments.
• Oil-Free Synthetic Media - No Oiling Required: Like all AEM DryFlow filters, the Brute Force requires no filter oil - eliminating the maintenance step and MAF sensor contamination risk associated with oiled cotton-gauze performance filters. Clean with AEM filter cleaner (PN 1-1000), rinse, air dry, and reinstall.
• Retains Shape Under Severe Abuse: The combination of the tougher Brute Force media and mineral-reinforced cage means this filter maintains its shape and performance even after impacts, compression from debris, and the physical stresses of off-road use - it will not deform, collapse, or lose its seal on the intake pipe under conditions that would damage a standard performance filter.
• Tapered Conical Profile - 6-Inch Base / 5.125-Inch Top / 5.125-Inch Height: The cone shape provides ample filter surface area in a compact package - fitting the majority of 3-inch intake tube installations across off-road trucks, buggies, UTVs, and custom race car intake systems.
• Closed Top Cap - Filter Top for Maximum Airflow: The closed top cap directs all incoming air through the full conical media surface, maximizing the effective filter area and airflow capacity of the 6-inch base body.

Specifications

• Part Number: 21-203BF
• Brand: AEM Induction Systems
• Product Line: Brute Force DryFlow
• Product Type: Brute Force DryFlow Universal Clamp-On Conical Air Filter
• Color: White
• Filter Shape: Round conical (tapered)
• Filter Media: Brute Force Heavy-Duty Non-Woven Synthetic (DryFlow - oil-free)
• Internal Cage: Mineral-reinforced lightweight plastic
• Flange Inside Diameter: 3.000 in (76mm) - fits 3-inch OD intake pipe
• Flange Length: 1.625 in (41mm)
• Flange Angle: 0 degrees (centered, straight)
• Flange Type: Centered (1 flange)
• Outside Diameter (Base): 6.000 in (152mm)
• Outside Diameter (Top): 5.125 in (130mm)
• Height: 5.125 in (130mm)
• Top Style: Closed cap
• Weight: 1.1 lbs (0.5 kg)
• Oiling Required: No
• Washable / Reusable: Yes
• CARB Compliance: Not CARB compliant - off-road / race use only
• Fitment: Universal
• Warranty: 1 Year Limited
• Quantity: 1 (sold individually)

Included Components

• 1x AEM Brute Force DryFlow Universal Clamp-On Conical Air Filter (21-203BF) - White
• Note: Intake pipe, hose clamp, and heat shield sold separately

Product Description

The AEM 21-203BF is a Brute Force DryFlow universal clamp-on conical air filter in white - AEM's heavy-duty performance filter line engineered specifically for off-road, racing, and harsh-environment applications where standard performance filters are not durable enough. It uses a tougher synthetic Brute Force filter media and a mineral-reinforced plastic cage that resists collapse under the high-vacuum, high-airflow demands of large and performance engines - maintaining its shape and structural integrity under the kind of physical abuse, dust loading, and repeated cleanings that would damage or deform a conventional filter.

The 3-inch flange fits any 3.000 in (76mm) OD intake tube. The 6-inch base tapers to 5.125 inches at the top across a 5.125-inch height. Oil-free DryFlow media requires no filter oil and is washable with AEM filter cleaner. This filter is NOT CARB compliant and is intended for off-road and competition use only - it is not legal for installation on street-registered vehicles in California or other CARB-adopting states. Universal fitment. 1-year limited warranty.