aFe Universal 4 inch Inlet Magnum FLOW Performance Air Filter
Looking for a universal 4 inch cone air filter that delivers high flow, excellent filtration and long service life for your performance build or cold air intake upgrade? The aFe POWER Magnum FLOW replacement air filter is a proven, washable and reusable performance air filter for enthusiasts who want more airflow and superior filtration without compromise. Perfect as a universal 4 inch inlet filter or as a direct replacement for many aFe Magnum FORCE Stage 2 intake systems.
At Nforcd we have fitted and used these filters on customer cars and our own projects, and feedback has been consistently positive. Customers love the build quality, the fit, the ease of maintenance and the noticeable improvement in intake flow and response.
Why choose this aFe POWER Magnum FLOW filter
- Universal 4 inch inlet air filter ideal for custom intakes, turbo setups and replacement applications
- High flow performance cone filter with deep, evenly spaced pleats for maximum surface area and airflow
- Outstanding filtration efficiency and dust holding capacity for street and light off-road use
- Durable 100% polyurethane top and base that keep their shape in hot engine bays for long-term reliability
- Innovative retention groove design locks into most aFe Stage 2 housings for tool-free servicing
- Washable and reusable for multiple cleaning cycles to reduce running costs
- Includes stainless steel clamp for secure installation
Choose your media to suit your build
- Pro DRY S — three layers of oil-free synthetic media. No oil required, easy to clean with aFe POWER Cleaner. Ideal for daily-driven street cars and light off-road use. Part number: 21-90113.
- Pro 5R — five layers of progressive oiled cotton gauze for maximum performance and flow. Part number: 24-90113.
Key dimensions
- Flange ID: 4 inches
- Base: 7-3/4 inches x 6-1/2 inches
- Top: 5-3/4 inches x 4-3/4 inches
- Height: 7 inches
Compatibility and common uses
Perfect as a universal 4 inch inlet cone filter for custom intakes, turbo inlet pipes and aftermarket cold air intake systems. Also a direct replacement filter for many aFe POWER Magnum FORCE Stage 2 intake kits, including popular BMW applications such as 335i, 435i, M135i and M235i where a 4 inch flange is required. If you are unsure on sizing, contact us and we will help you choose the correct filter.
Technical highlights
- Rounded deep open pleats increase usable filter area for greater flow and longer service intervals
- Polyurethane end caps withstand repeated heat cycles and maintain a precise seal
- Retention groove interface allows quick install and removal in compatible housings
- Designed for performance intake systems seeking improved airflow and dependable filtration
Part numbers
- Pro 5R Air Filter: 24-90113
- Pro DRY S Air Filter: 21-90113
Installation and fitting
This filter is straightforward to fit with the included stainless clamp. For professional fitting, custom intake fabrication or verification of clearance and heat management, we recommend booking installation with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Manufacturer
aFe POWER
Warranty
Limited lifetime warranty.
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