Performance Air Filter for BMW 5 Series / X1 / Z4

Precision Induction: High-Flow BMC Performance Filter for BMW N20 & N52 Platforms

Who It’s For: Engineered for BMW owners running the N20B20 turbocharged inline-four or the N52 naturally aspirated inline-six who want to optimize their engine’s breathing without the complexity of a full intake system swap.

The Symptom: The factory paper air filter in your BMW is designed with one primary goal: sound suppression. By using thick, dense cellulose fibers, the OEM filter creates significant air resistance that chokes the turbo spool on N20 engines and limits the high-RPM breathing of the N52. You’ll notice this as a slight hesitation during initial tip-in or a feeling that the engine is "falling flat" as you approach the redline. This restriction forces the engine to work harder just to pull air into the combustion chamber, increasing pumping losses and robbing you of throttle snap.

The Engineering Fix: BMC’s performance filter replaces that restrictive paper with a multi-layered cotton gauze media, soaked in low-viscosity oil and reinforced by an epoxy-coated alloy mesh. This design utilizes the physics of depth filtration; rather than just blocking particles on the surface, it traps impurities as small as 7 microns within the layers, allowing a much higher volume of air to pass through freely. The "Full Moulding" construction ensures the filter frame is a single piece with no welded joints, eliminating potential air bypass and providing a perfect seal within your BMW’s factory airbox to maintain maximum intake velocity.

Why Mechanics Choose This Kit

• Optimized Fluid Dynamics: The low-viscosity oil-soaked cotton significantly reduces air turbulence compared to dry paper, allowing the turbocharger on the F10 and E84 platforms to reach target boost pressures with less effort.
• Superior Filtration Threshold: While OEM filters typically stop at 10 microns, BMC engineering captures particles down to 7 microns, providing better protection for your cylinder walls and MAF sensor.
• Lifetime Sustainability: Unlike disposable filters that end up in a landfill every 15,000 miles, this T304 alloy-reinforced unit is fully washable and rechargeable using a standard regeneration kit.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• BMW 5 (F10, F11, F18) 520i (163 HP) | 2011 >
• BMW 5 (F10, F11, F18) 520i (170 HP) | 2015 >
• BMW 5 (F10, F11, F18) 520i (184 HP) | 2011 >
• BMW 5 (F10, F11, F18) 520i (184 HP) | 2013 >
• BMW 5 (F10, F11, F18) 528i (245 HP) | 2011 >
• BMW 5 GT (F07GT) 528i Gran Turismo (245 HP) | 2013 >
• BMW X1 (E84) 16i (143 HP) | 2013 >
• BMW X1 (E84) 20i (184 HP) | 2011 >
• BMW X1 (E84) 20iX (184 HP) | 2011 >
• BMW X1 (E84) 28iX (245 HP) | 2011 >
• BMW Z4 (E89) 18i (156 HP) | 2013 >
• BMW Z4 (E89) 20i (184 HP) | 2011 >
• BMW Z4 (E89) 23i (204 HP) | 2009 >
• BMW Z4 (E89) 28i (245 HP) | 2011 >
• BMW Z4 (E89) 30i (258 HP) | 2009 >

Interchange Part Numbers:

FB724/01, 272-251-BMC

The Performance Promise

Buy with confidence. At our shop, we only move parts that we’d run on our own builds. This BMC filter is the standard for European performance, offering a balance of air density and engine protection that factory paper simply can’t match. Backed by real automotive experts and fast shipping.