Pipercross Performance Panel/Drop-In Air Filter for BMW 4 Series 420i F32 (2013+) N20B20A – High-Flow Washable Reusable Foam Intake/Airbox Filter, OEM Replacement Sport Engine Air Filter

Unlock effortless breathing for your BMW 4 Series 420i F32 N20B20A with a Pipercross high-flow drop-in sport filter. Swap the restrictive paper element in the original air box for a serviceable foam performance filter that delivers stronger intake flow, reliable filtration and long-term value. Designed to fit the standard housing on 2013 onwards 420i models, this is the simple intake upgrade that just works.

Key reasons enthusiasts choose this upgrade

• Direct-fit, drop-in element for the factory air box. No cutting or drilling.
• Significant airflow gain compared with a disposable paper insert for improved response and drivability.
• Triple-layer reticulated foam media balances high flow with excellent dust capture.
• Washable and reusable to reduce running costs over the life of the car.
• Built in Britain for precise fit and dependable performance.
• Lifetime road-use warranty from Pipercross.

Performance foam media that keeps flowing

Pipercross uses a progressive, multi-porosity foam matrix. The outer layer stops larger particles, the middle layer deals with the fine stuff and the inner layer finishes the job. This staged filtration keeps restriction low even as miles build, helping your turbocharged N20 engine maintain smooth acceleration and consistent throttle response where paper elements can clog and choke.

Fitment

BMW 4 Series F32 420i, 2013 onwards, engine code N20B20A. Suits the original equipment air box as a like-for-like replacement panel element.

What we have seen

We run Pipercross filters on our own cars and our customers love the upgrade. Expect a simple, effective induction refresh that feels livelier on the road while saving money over repeated paper filter changes.

Professional fitting

Want it installed for you? MJ Modifications offers expert fitting in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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