K&N Washable Reusable High-Flow Panel Engine Air Filter for BMW X4 F26 2014–2018 xDrive35i/35iX & M40i | Cotton Gauze Drop-In OEM Airbox Replacement Performance Intake Filter

K&N cleanable cotton panel insert for BMW X4 F26 xDrive35i, 35iX and M40i 2014 to 2018

Give your BMW X4 the breathing it deserves with a premium K&N serviceable panel insert. This precision-fit element slots straight into the factory airbox on X4 F26 xDrive35i, 35iX and M40i models from 2014 to 2018, helping the engine inhale more efficiently for crisper throttle response, stronger mid‑range pull and a richer induction note while retaining excellent filtration for daily driving.

Why enthusiasts choose this upgrade

• Enhanced engine response and smoother acceleration without software changes
• High airflow cotton gauze media with outstanding dirt retention for road and spirited use
• Reusable and cleanable to cut long‑term running costs versus disposable paper elements
• Straight swap into the OEM airbox, no cutting, drilling or remap required
• Works seamlessly with factory sensors and ECU strategies
• Extended service interval, up to 50,000 miles before cleaning depending on conditions
• Backed by K&N’s limited warranty and decades of filtration expertise

Real world results

We run these filters on our own shop cars and have installed them for many BMW owners. Feedback is consistently positive, with customers praising the OEM+ feel, improved drivability and the value of a washable element that keeps performing year after year.

Compatibility

BMW X4 F26 xDrive35i, 35iX and M40i, model years 2014, 2015, 2016, 2017, 2018.

If you would like us to double‑check fitment against your registration or VIN, get in touch and we will confirm before you buy.

Fitting and maintenance

Installation is a simple under‑bonnet swap with basic hand tools. For professional fitting, choose MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quotation.

When it is time to service, clean and re‑oil with an appropriate K&N care kit, refit and you are ready to go. Reduce waste, save money and keep performance consistent.

Why buy from us

• Specialists in BMW performance upgrades and OEM+ enhancements
• Products we have tried, tested and are happy to recommend
• Helpful advice before and after purchase from enthusiasts who install what they sell

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