AEM Dryflow Round Tapered Universal Air Filter - 3in Flange ID x 5in Top x 6in Base x 5.563in H - 21-203D-XK

The AEM Dryflow 21-203D-XK is a universal clamp-on air filter engineered for performance-minded drivers who require high-efficiency filtration without the maintenance hassle of oiled filters. Utilizing an innovative oil-free synthetic media, this filter provides a durable, washable solution that maintains excellent airflow and filtration levels even in demanding environments.

Designed as a round tapered unit, this filter features a dedicated filter top to increase total surface area, allowing for higher airflow capability compared to standard closed-top designs. The 3-inch flange ID ensures a secure fit on many aftermarket intake systems, while the synthetic construction allows for quick cleaning with AEM synthetic filter cleaner and a simple water rinse—no re-oiling required.

• Oil-Free Filtration: High-performance synthetic media simplifies maintenance and eliminates the risk of oil-fouling sensitive MAF sensors.
• Universal Fitment: Designed for custom intakes or as a replacement for existing 3-inch flange filters.
• Durable Build: Washable and reusable construction backed by AEM’s limited warranty.

• Manufacturer Part Number: 21-203D-XK
• Flange Internal Diameter: 3 in (76 mm)
• Top Outer Diameter: 5 in (127 mm)
• Base Outer Diameter: 6 in (152 mm)
• Filter Height: 5.563 in (141 mm)
• Filter Material: Non-woven Synthetic
• Shape: Round Tapered