aFe 21-91004 Magnum FLOW Pro DRY S Universal Air Filter (5" Flange)

Vehicle Fitment

• Universal Fit - Designed for compatible performance intake systems with ~5" inlet flange (Not vehicle-specific; verify fitment with intake manufacturer)

Features

• Magnum FLOW Pro DRY S oil-free synthetic media for high airflow and easy maintenance
• Washable and reusable design for multiple cleaning cycles and extended life
• Pliable polyurethane flange with integrated bump seals for a secure, leak-free fit
• Deep, open pleat design increases usable surface area and airflow capacity
• Conical performance shape enhances engine breathing over restrictive stock filters
• Durable 100 % polyurethane top and base construction
• Universal design fits many aftermarket cold air and performance intake systems
• Oil-free media eliminates messy oil application during maintenance

Specifications

• Part Number: 21-91004
• Filter Media: Pro DRY S synthetic, oil-free
• Flange Inside Diameter: 5.00 in
• Base Outside Diameter: ~8.00 in
• Top Outside Diameter: ~6.00 in
• Filter Height: ~7.00 in
• Shape: Conical performance air filter
• Reusable/Washable: Yes

Included Components

• 1x aFe Magnum FLOW Pro DRY S Universal Air Filter (21-91004)

Product Description

The aFe 21-91004 Magnum FLOW Pro DRY S Universal Air Filter is a high-flow performance air filter element designed to enhance airflow and filtration efficiency in compatible aftermarket intake systems with a ~5" inlet flange. Featuring advanced Pro DRY S oil-free synthetic media, this filter delivers excellent airflow while efficiently capturing dust and contaminants, helping improve engine breathing and responsiveness compared with restrictive stock filters. Its washable and reusable design simplifies maintenance and extends service intervals.

Constructed with a pliable polyurethane flange featuring integrated bump seals and a rugged polyurethane top and base, the 21-91004 creates a secure, leak-free fit when clamped into performance intake openings. The deep pleat conical design increases usable surface area, boosting dust holding capacity and filter life. Because this part is a universal filter element rather than a vehicle-specific product, always verify that your intake system matches the filter's flange size before installation to ensure proper fit and performance.