aFe 21-91039 MagnumFLOW Pro DRY S Conical Air Filter 5F x 6.5B x 5.5T x 9H

Vehicle Fitment

• Universal Fit - compatible with any cold air intake, short ram intake, or custom intake system with a 5.0" inside diameter inlet opening

Fitment Notes

• Universal fitment - not vehicle-specific. Customer must verify that the intake tube or coupler has a 5.0" inside diameter opening to accept the filter's flange.
• Clamp-on style - compatible with any intake tube measuring 5.0" I.D. at the mounting point.
• Primarily used as a replacement filter for aFe Magnum FORCE cold air intake systems designed around a 5.0" inlet - verify your intake system's filter size before ordering.
• Pro DRY S media is oil-free - no filter oil required. Do not apply filter oil to this filter.
• Suitable for both gasoline and diesel engine applications in street and light off-road use.

Features

• Three layers of progressively finer mesh synthetic media for optimum filtration and high airflow, even when dirty
• Oil-free Pro DRY S design - no oiling required, no risk of MAF sensor contamination
• Tall, evenly spaced open pleats maximize filter surface area and dust-holding capacity for extended service intervals
• 100% polyurethane top and base frame for structural rigidity and long filter life
• Pliable polyurethane flange with integrated bump seal ensures a tight, leak-free, gasket-free fit
• Washable and reusable - cleans with soap and water or aFe Power Cleaner
• 99.2% filter efficiency for maximum engine protection without restricting airflow
• Conical shape maximizes filter surface area within a compact footprint

Specifications

• Filter Style: Conical, Clamp-On
• Flange Inside Diameter (Inlet): 5.0"
• Base Diameter: 6.5"
• Top Diameter: 5.5"
• Height: 9.0"
• Filter Media: Non-Woven Synthetic (3-Layer Progressive)
• Media Type: Pro DRY S (Oil-Free)
• Filter Efficiency: 99.2%
• Filter Color: Gray
• Frame Material: 100% Polyurethane
• Flange Position: Center
• Washable: Yes / Reusable: Yes / Pre-Oiled: No
• Compatible Fuel Types: Gasoline and Diesel

Included Components

• 1x aFe MagnumFLOW Pro DRY S Conical Air Filter (21-91039)

Product Description

The aFe 21-91039 MagnumFLOW Pro DRY S is a large-format universal conical clamp-on air filter designed for performance intake systems, cold air kits, and custom intake builds requiring a 5.0" inlet. Its three-layer progressive synthetic media delivers 99.2% filter efficiency with exceptional airflow in a completely oil-free design - making it an ideal choice for both gasoline and diesel applications where MAF sensor protection and easy maintenance are priorities.

At 9.0" tall with a 6.5" base, the 21-91039 offers substantial filter surface area and excellent dust-holding capacity for extended service intervals. The pliable polyurethane flanged base with integrated bump seals provides a tight, leak-free clamp-on seal without sealants or gaskets. Maintenance is simple - wash with water and aFe Power Cleaner, allow to dry, and reinstall. No re-oiling required. This filter is commonly used as a replacement element for aFe Magnum FORCE cold air intake systems with 5.0" inlet tubes, and is compatible with any 5.0" I.D. intake tube or coupler.