BMW X4 M40i Air Filter - Dinan High Flow Drop-in Replacement (2018–2019). A direct-fit, reusable upgrade for the factory air box that improves airflow while maintaining reliable filtration.

Built with four layers of oiled cotton gauze, this Dinan filter reduces pressure drop compared to paper media, helping the B58 engine breathe easier under load. It installs in minutes in the stock air box and is washable for long-term use, reducing routine replacement costs. General dimensions: 270mm x 218mm. Verify fitment by OEM part numbers: 13718577170, 13718691835, 13718621473, 13718577171, 13718454387, 13712454387.

Features

• Direct replacement for 2018–2019 X4 M40i (G02) stock air box
• 4-layer oiled cotton gauze for high flow and filtration
• Less restrictive than stock to support performance and efficiency
• Washable and reusable for the life of the engine
• Quick, easy installation

Have questions or planning an install? Call our Austin, TX shop at 512-982-9393 or our Los Angeles, CA area shop at 562-981-6800. We offer installation and customization services at both locations.

If you are purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov