Performance Air Filter for BMW 3 Series/4Series/5 Series/6 Series/7 Series Diesel

Precision Air Induction for the BMW N57 Diesel Platform

Who It’s For: Engineered for BMW owners running the N57 inline-six diesel powerplant across the F-Chassis range who want to optimize turbo efficiency without compromising engine longevity.

The Symptom: The factory air filtration system on the N57 engine is built around a thick, restrictive paper element designed for maximum sound suppression and long service intervals. For a high-torque diesel engine, this creates a significant bottleneck. As the turbochargers attempt to spool, they have to work harder to pull air through the dense paper fibers, leading to a measurable pressure drop in the intake tract. This results in a slight delay in throttle response, especially during low-end acceleration or when merging on the highway.

The Engineering Fix: The BMC FB821/04 filter replaces that restrictive paper with a multi-layered cotton gauze system. By using four layers of surgical-grade cotton soaked in a low-viscosity oil, we change the fluid dynamics of the intake. Instead of air hitting a paper wall, it flows through an epoxy-coated alloy mesh that creates a more laminar flow. This allows for filtration down to 7 microns—significantly tighter than the OEM 10-micron standard—while simultaneously increasing the total air volume available to the turbocharger. The result is a more efficient combustion cycle and a faster turbo spool-up.

Why Mechanics Choose This Kit

• Enhanced Surface Area: The "Full Moulding" construction eliminates welded joints, allowing the filter to utilize the maximum possible surface area within the factory airbox for better air density.
• Industrial Durability: Unlike cheap plastic-framed filters, the rubber used by BMC is formulated to resist heat-soak and maintain a perfect seal against the airbox walls, preventing dirty air bypass.
• Washable Performance: This isn’t a disposable part. Because it uses an alloy mesh and cotton gauze, it can be cleaned and re-oiled, maintaining peak flow rates for the life of the vehicle.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• BMW 3 (F30, F31, F80) 330 D (258 HP) 2012+
• BMW 3 (F30, F31, F80) 335 DX (313 HP) 2013+
• BMW 3 GT (F34) 330 D GRAN TOURISMO (258 HP) 2014+
• BMW 3 GT (F34) 335 DX GRAN TOURISMO (313 HP) 2014+
• BMW 4 (F32, F33, F36, F82) 430 D (258 HP) 2013+
• BMW 4 (F32, F33, F36, F82) 435 D (313 HP) 2013+
• BMW 5 (F10, F11, F18) 530 D (258 HP) 09/2011+
• BMW 5 (F10, F11, F18) 535 D (313 HP) 2011+
• BMW 5 (F10, F11, F18) M 550 D (381 HP) 2012+
• BMW 5 GT (F07GT) 530 D GRAN TOURISMO (258 HP) 2012+
• BMW 5 GT (F07GT) 535 D GRAN TOURISMO (313 HP) 2012+
• BMW 6 (F12, F13) 640 D (313 HP) 2011+
• BMW 6 GC (F06GC) 640 D GRAN COUPÈ (313 HP) 2012+
• BMW 7 (F01, F02, F03, F04) 730 D (258 HP) 2012+
• BMW 7 (F01, F02, F03, F04) 740 D (313 HP) 2012+
• BMW 7 (F01, F02, F03, F04) 750 D (381 HP) 2012+

Interchange Part Numbers:

FB821/04

The Performance Promise

Buy with confidence. We understand the intricacies of BMW’s diesel engineering. Our team ensures that every part we stock provides a legitimate upgrade to the driving experience. This BMC filter is a direct-fit replacement, meaning no modification to your expensive OEM airbox is required.