K&N 33-2231 High-Flow Panel Air Filter for 1998-2007 BMW 3 Series

Vehicle Fitment

• 1998-2000 BMW 323i Sedan (E46, 2.5L I6, RWD)
• 1999-2000 BMW 323Ci Coupe (E46, 2.5L I6, RWD)
• 1998-2000 BMW 328i Sedan (E46, 2.8L I6, RWD)
• 1999-2000 BMW 328Ci Coupe (E46, 2.8L I6, RWD)
• 2001-2006 BMW 325i Sedan (E46, 2.5L I6, RWD)
• 2001-2006 BMW 325Ci Coupe/Convertible (E46, 2.5L I6, RWD)
• 2001-2005 BMW 325xi Sedan/Wagon (E46, 2.5L I6, AWD)
• 2001-2006 BMW 330i Sedan (E46, 3.0L I6, RWD)
• 2001-2006 BMW 330Ci Coupe/Convertible (E46, 3.0L I6, RWD)
• 2001-2005 BMW 330xi Sedan (E46, 3.0L I6, AWD)
• 2001-2006 BMW M3 Coupe/Convertible (E46, 3.2L I6, RWD)
• 2004-2006 BMW X3 2.5i (E83, 2.5L I6, AWD)
• 2004-2006 BMW X3 3.0i (E83, 3.0L I6, AWD)

Fitment Notes

• Direct replacement panel air filter for the factory air box.
• Compatible with both standard and xi AWD models where listed.
• BMW M3 models require the alternate installation procedure outlined in the K&N instructions.

Features

• High-flow multi-layer oiled cotton gauze filter media.
• Designed to improve airflow and throttle response.
• Washable and reusable for the life of the vehicle.
• Direct drop-in replacement with no modifications required.
• Up to 99% overall filtration efficiency.
• Engineered to help maintain consistent engine performance.
• Flexible sealing surface provides OE-quality fit.
• Pre-oiled and ready to install.

Specifications

• Filter Style: Panel
• Filter Media: Oiled Cotton Gauze
• Washable: Yes
• Overall Filtration Efficiency: Up to 99%
• Outside Length: 9.375 in (238 mm)
• Outside Width: 6.875 in (175 mm)
• Height: 1.063 in (27 mm)
• Filter Re-Oiling Amount: 1.0 oz (30 ml)
• Position: Engine Air Box

Included Components

• 1x K&N 33-2231 High-Flow Replacement Panel Air Filter

Product Description

The K&N 33-2231 High-Flow Replacement Air Filter is engineered as a direct-fit upgrade for select BMW E46 3 Series and E83 X3 models. Its advanced oiled cotton gauze media delivers increased airflow compared to conventional disposable filters while maintaining excellent filtration efficiency, helping improve engine breathing and throttle response.

Designed to fit the factory air box without modifications, this reusable panel filter can be cleaned and re-oiled instead of replaced, reducing maintenance costs over the life of the vehicle. Its durable construction and precision fit make it an ideal performance upgrade for both daily-driven and enthusiast BMW applications.