aFe Power 21-91020 Magnum FLOW Pro DRY S Universal Air Filter (4" x 6" x 6")

Vehicle Fitment

• Universal / Clamp-On (Not vehicle-specific application)

Features

• Three layers of progressively finer synthetic media (Pro DRY S)
• Oil-free - no need to re-oil after cleaning
• Washable and reusable through multiple cleaning cycles
• 100% polyurethane top and base for durability
• Deep, open pleated design to maximize dust-holding capacity
• Inverted top for increased surface area and longer service intervals
• Pliable polyurethane flange with integrated bumps for tight, leak-free seal
• 99.2% filtration efficiency

Specifications

• Part Number: 21-91020
• Filter Type: Conical / Round
• Flange ID: 4.0"
• Base Diameter: 6.0"
• Top Diameter: ~4.5" (inverted)
• Height: 6.0"
• Media: 3-layer synthetic, non-oiled
• Seal Material: Polyurethane
• Reusable: Yes
• Warranty: 2-year limited (as per retailer) 

Included Components

• 1x aFe Power Magnum FLOW Pro DRY S Air Filter (PN 21-91020)

Product Description

The aFe Power Magnum FLOW Pro DRY S Air Filter (part number 21-91020) is a high-performance, universal replacement filter designed for clamp-on applications. Its three-layer synthetic media offers excellent filtration without the need for oil, making it more convenient to maintain.

Built with a sturdy polyurethane top and base, this conical filter features deep pleats and an inverted top design to maximize surface area and dust-holding capacity. The pliable flange with integrated bumps ensures a tight, secure seal when installed.

Because it is washable and reusable, the 21-91020 can be cleaned and re-used multiple times, reducing cost of ownership. With 99.2% efficiency, it provides strong protection for your engine while still allowing high airflow - ideal for street performance, daily drivers, or custom intakes. Note: This is a *universal filter* - it requires a compatible intake housing or a pipe to clamp to.