K&N Performance High-Flow Washable Panel Air Filter for BMW 4 Series Diesel (F32/F33/F36/F82) 418d 420d 425d 2013-on | Reusable Drop-In OEM Replacement

K&N Performance High-Flow Washable Panel Air Filter for BMW 4 Series Diesel (F32/F33/F36/F82) 418d 420d 425d 2013-on | Reusable Drop-In OEM Replacement

£63.89
£63.89
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K&N Performance Air Filter for BMW 4 Series F32 F33 F36 F82 418d 420d 425d 2013 onwards

Upgrade your BMW 4 Series with a genuine K&N performance air filter and unlock easy, reliable performance. This high-flow, washable, reusable panel air filter is a direct drop-in replacement for your stock paper filter, designed to increase horsepower and improve acceleration while maintaining excellent engine protection and filtration. It fits the original BMW air box with no modifications, keeping your OEM setup intact while letting your engine breathe better.

Perfect for daily driving and spirited road use, the K&N replacement air filter delivers strong airflow and long service life. Many of our Nforcd customers choose this as their first performance upgrade because it is quick to fit, cost-effective over time and proven. We run K&N filters in our own cars and the feedback has been consistently positive.

Key features and benefits

  • Designed to boost horsepower and rate of acceleration
  • High airflow with exceptional filtration for BMW diesel engines
  • Washable and reusable panel filter for long-term value
  • Up to 50,000 miles between cleans depending on driving conditions
  • Direct replacement for the OEM filter in the factory air box
  • Works with original vehicle electronics, no tuning required
  • Will not void your vehicle warranty
  • K&N Million-Mile Limited Warranty

Fitment and compatibility

BMW 4 Series 2013 onwards, including:

  • F32 Coupe 418d, 420d, 425d
  • F33 Convertible 418d, 420d, 425d
  • F36 Gran Coupe 418d, 420d, 425d
  • F82 as listed

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Why choose a K&N replacement filter

K&N’s drop-in design means simple performance gains without compromising reliability. Replace your disposable paper filter once and enjoy long intervals between services with straightforward cleaning. Strong airflow plus excellent filtration gives your BMW efficient breathing for responsive performance and dependable protection.

Installation and fitting

This is a quick DIY install with basic tools. If you would prefer professional fitting, Nforcd can help. We offer installation at our Warwickshire workshop. Request a fitting quote by emailing Sales@nforcd.com.

Order your K&N performance air filter today for a simple, proven upgrade to your BMW 4 Series. Better airflow, strong filtration and long-term value in one essential panel filter.