Performance Air Filter for BMW 1 Series / 3 Series / X1

Precision Induction for the BMW N4x-Series: BMC High-Flow Filtration

Who It’s For: Engineered for BMW 1 Series, 3 Series, and X1 owners running the N43, N45, and N46 in-line four-cylinder powerplants. If you find your E90 or E87 feels a bit breathless during mid-range acceleration, this is the first step in correcting that factory bottleneck.

The Symptom: The factory intake system on these BMW four-bangers is designed with a heavy bias toward sound suppression. The stock paper filter is dense, creating a significant pressure drop as air struggles to pass through the tightly packed fibers. This restriction forces the engine to work harder just to breathe, resulting in a delayed throttle response and a feeling of "heaviness" when you’re trying to merge into traffic or pull out of a tight corner.

The Engineering Fix: BMC’s solution replaces the disposable paper element with a multi-layered cotton gauze system. By using a "Full Moulding" process, the filter is constructed from a single soft rubber mould without any welded joints, ensuring a perfect seal within the BMW airbox. The physics are simple: the cotton gauze, treated with low-viscosity oil, allows for a much higher velocity of air to enter the intake tract. This increases the volumetric efficiency of the engine by filtering out particles as small as 7 microns without the massive air-flow resistance of paper.

Why Mechanics Choose This Kit

• Optimized Flow Dynamics: Reduces the vacuum effect in the airbox, allowing the N46 and N43 engines to reach their peak torque figures more efficiently.
• Superior Filtration: While OEM filters stop at 10 microns, BMC’s epoxy-coated alloy mesh and cotton setup captures impurities down to 7 microns, protecting the sensitive Mass Air Flow (MAF) sensor.
• Sustainable Performance: Unlike paper filters that end up in a landfill every 15,000 miles, this unit is fully washable and regenerable, maintaining its structural integrity and flow rates for the life of the vehicle.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• BMW 1 (E81, E82, E87, E88) 116 I (115 HP) 2004 > 2007
• BMW 1 (E81, E82, E87, E88) 116 I (122 HP) 2009 > 2012
• BMW 1 (E81, E82, E87, E88) 118 I (129 HP) 2004 > 2012
• BMW 1 (E81, E82, E87, E88) 118 I (136 HP) 2008 >
• BMW 1 (E81, E82, E87, E88) 118 I (143 HP) 2007 > 2012
• BMW 1 (E81, E82, E87, E88) 120 I (150 HP) 2004 > 2007
• BMW 1 (E81, E82, E87, E88) 120 I (156 HP) 2007 > 2012
• BMW 1 (E81, E82, E87, E88) 120 I (170 HP) 2007 > 2012
• BMW 3 (E90, E91, E92, E93) 316 I (116 HP) 2006 >
• BMW 3 (E90, E91, E92, E93) 316 I (129 HP) 2007 >
• BMW 3 (E90, E91, E92, E93) 316 I 1.6 (116 HP) 2008 >
• BMW 3 (E90, E91, E92, E93) 318 I (129 HP) 2005 > 2007
• BMW 3 (E90, E91, E92, E93) 318 I (143 HP) 2007 >
• BMW 3 (E90, E91, E92, E93) 320 I (150 HP) 2005 > 2007
• BMW 3 (E90, E91, E92, E93) 320 I (150 HP) 2006 > 2007
• BMW 3 (E90, E91, E92, E93) 320 I (170 HP) 2006 >
• BMW 3 (E90, E91, E92, E93) 320 SI (173 HP) 2005 > 2006
• BMW X1 (E84) 18 I (150 HP) 2010 >

Interchange Part Numbers:

FB677/08, 13717532754, 7532754

The Performance Promise

Buy with confidence. As tuners, we only recommend BMC because their filters provide the best balance between debris protection and laminar airflow. Your BMW’s engine deserves better than a paper clog. Fast shipping and expert support come standard.