K&N High-Flow Performance Panel Air Filter for BMW 1 Series (F20/F21) 125i 201205/2016 Washable, Reusable, Drop-In Direct-Fit OEM Air Box Upgrade

K&N Sports Panel Filter Upgrade for BMW 1 Series 125i F20 F21 2012 to 05/2016

Free up your BMW 125i’s breathing with this K&N performance panel filter. Built to slide straight into the standard airbox on F20 and F21 models from 2012 to May 2016, it delivers higher airflow, crisp throttle response and a deeper induction note while maintaining superb engine protection. No cutting, no mapping, no fuss.

Why enthusiasts choose this upgrade

• Direct replacement element for the factory airbox with a precise OE-style fit
• Oiled multi-layer cotton gauze media for excellent flow and reliable filtration
• Sharper pedal feel and stronger mid-range pull for confident overtakes
• Reusable for life of the vehicle. Clean, re-oil and refit instead of buying disposable paper filters
• Extended service interval up to 50,000 miles depending on driving conditions
• Works with standard ECU and sensors. No remap required
• Backed by K&N’s Million Mile Limited Warranty

Fitment

BMW 1 Series 125i F20 and F21, model years 2012 to 05/2016. Fits inside the original airbox as a like-for-like replacement element.

Real-world results

We run this filter on our own BMW 1 Series builds and it is a standout fast-road upgrade. Customers consistently report improved throttle response, a more urgent surge through the revs and a tasteful induction sound, all while keeping factory refinement for daily use.

Performance and maintenance made simple

Compared to a throwaway paper element, this serviceable cotton filter lets your engine breathe more easily for responsive, repeatable performance. When it becomes dirty, simply clean and re-oil with a K&N care kit, then refit. It is a cost-effective upgrade that pays for itself over time.

What is included

• 1 x genuine K&N high-flow reusable panel filter for BMW 125i F20 F21
• Installation is a straightforward swap for the stock element

Fitting services

DIY friendly with basic tools. Prefer professional installation or a health check while you are here. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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Upgrade your BMW 125i with a proven intake element that combines performance, protection and long-term value. This K&N panel filter is the smart choice for anyone who wants responsive power and a subtle induction character without changing the original airbox.