K&N Performance Air Filter for BMW 1 Series Diesel F20/F21 (2011-2019) – Washable Reusable Cotton Gauze Panel, High-Flow Drop-In OEM Replacement Fits 116d 118d 120d 125d, Induction Upgrade for Factory Airbox

Give your BMW 1 Series diesel the intake it deserves with a genuine K&N washable cotton panel element engineered for the F20 and F21 platform from 2011 onward. This simple swap for the stock paper filter lets the engine breathe more freely for a crisper pedal, smoother pull through the rev range and robust protection against dirt and debris. It is a serviceable, reusable upgrade that saves money over time and reduces waste, backed by K&N’s famous Million-Mile Limited Warranty.

What you get

• Direct-fit panel element for the factory airbox on BMW 1 Series diesel F20 and F21
• Higher intake volume with excellent dust capture for confident everyday performance
• Multi-layer oiled cotton media that is cleanable and designed to last the life of the vehicle
• Long service intervals between cleans depending on driving conditions
• Works seamlessly with the standard ECU and sensors, no remap required
• No impact on manufacturer warranty when correctly installed and maintained
• Covered by K&N’s Million-Mile Limited Warranty for long-term peace of mind

Real-world results

At MJ Modifications we use these filters on our own BMW diesels and have fitted them for countless customers. Feedback is consistently positive: improved throttle response, a nicer induction note under load and the convenience of a lifetime filter you can clean and refit. It is a quick win for daily driving, commuting and fast road use.

Compatibility

Suitable for BMW 1 Series F20 and F21 diesel models from 2011 onward using the standard airbox. If you would like us to confirm fitment for your specific vehicle, get in touch and we will be happy to help.

Installation and support

Home install is straightforward with basic tools. Prefer a professional fitment service or a health check of your intake system at the same time? MJ Modifications offers expert installation at our Warwickshire workshop. Request a quote at info@mjmodifications.co.uk.

Care and maintenance

When the time comes, clean and re-oil using a K&N service kit. The reusable design means you buy once, then maintain, cutting down on replacement costs and landfill.

Why this upgrade makes sense

• Reusable performance panel element replaces disposable paper filters
• Cost-effective over the life of the car and better for the environment
• Optimises the factory intake without extra noise or modifications
• Ideal first step to support future tuning and intake breathing improvements

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