BMC FB472/20 High-Performance Replacement Panel Air Filter for Alpina B5 4.4L

The BMC FB472/20 is a high-performance replacement panel air filter designed as a direct-fit upgrade for the 2005–2007 Alpina B5 equipped with the 4.4L engine. BMC (Bologna Motor Company) filters are engineered in Italy and trusted by motorsport professionals and performance enthusiasts worldwide for their superior filtration efficiency and increased airflow over standard OEM paper filters.

This panel filter features BMC's signature oiled cotton gauze filtration media, which provides exceptional particle capture while allowing greater air volume to reach the engine. The result is improved throttle response and sustained performance over a long service life. The filter is built on a rigid frame to ensure a precise, rattle-free fit within the factory airbox — no modifications required.

Key Features:

• Direct OEM replacement — fits directly into the factory airbox
• Multi-layered oiled cotton gauze media for high filtration efficiency
• Increased airflow compared to standard paper filters for improved engine response
• Durable steel mesh backing for structural integrity
• Washable and re-oilable for extended service life — reduces long-term replacement costs
• Manufactured in Italy to strict motorsport-derived quality standards
• Compatible with 2005–2007 Alpina B5 4.4L engines

BMC filters are a favorite among European performance car owners for their quality construction and measurable performance gains. The FB472/20 installs in minutes using standard hand tools and is serviced using BMC's dedicated cleaning and re-oiling kit.