aFe 21-90037 Magnum FLOW Pro DRY S Universal Air Filter (4.375" Flange)

Vehicle Fitment

• Universal Fit - Designed for compatible performance intake systems with ~4.375" inlet (Not vehicle-specific; verify with intake manufacturer)

Features

• Magnum FLOW Pro DRY S oil-free synthetic media for excellent airflow and easy maintenance
• Washable and reusable design for repeated cleanings and extended filter life
• Pliable polyurethane flange with integrated bumps for a secure, leak-free seal
• Conical shape with deep, open pleats increases usable surface area and airflow capacity
• High airflow performance over restrictive stock filters
• Durable 100 % polyurethane top and base construction
• Universal design fits many aftermarket cold air and performance intake systems
• Oil-free synthetic media eliminates messy oiling during service

Specifications

• Part Number: 21-90037
• Filter Media: Pro DRY S synthetic, oil-free
• Flange Inside Diameter: 4.375 in
• Base Outside Diameter: 9.00 x 6.00 in (oval conical)
• Top Outside Diameter: 5.50 in
• Filter Height: 9.00 in
• Shape: Oval conical performance air filter
• Reusable/Washable: Yes

Included Components

• 1x aFe Magnum FLOW Pro DRY S Universal Air Filter (21-90037)

Product Description

The aFe 21-90037 Magnum FLOW Pro DRY S Universal Air Filter is a high-flow performance filter element engineered to improve airflow and filtration efficiency in compatible aftermarket intake systems with a ~4.375" inlet. Featuring advanced Pro DRY S oil-free synthetic media, this filter provides excellent airflow while efficiently capturing dust and contaminants. Its washable and reusable design helps keep long-term maintenance costs low compared with disposable filters.

Constructed with a durable polyurethane top and base and a pliable flange with integrated seal bumps, the 21-90037 creates a tight, leak-free fit when clamped into performance intake openings. The conical design with deep, open pleats increases usable surface area, supporting extended service intervals and improved engine breathing. Always verify that your intake system accepts a ~4.375" inlet filter before installation for proper fit and performance.