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K&N BMW Replacement Air Filter F20 F21 (M135i) ML Performance UK

K&N BMW N55 Replacement Air Filter F20 F21 (M135i, M2, M235i 335i & 435i)


  • £52.58
    exc. VAT £43.82

In Stock


K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.



  • Designed to add power & acceleration for 2012 BMW M135i with 3.0L engines.
  • Washable & Reusable
  • K&N's air filter for the M135i is designed to last the life of your vehicle.
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®


Compatibility Check

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.



BMW 235i, BMW 335i, BMW 335i GT, BMW 335i GT xDrive, BMW 335i xDrive, BMW 435i, BMW 435i Gran Coupe, BMW 435i xDrive, BMW 435i xDrive Gran Coupe, BMW ActiveHybrid 3, BMW i8, BMW M135i, BMW M2, BMW M235i, and BMW M235i xDrive



FREE UK next day delivery if ordered before 11am on all in stock items! We can also ship worldwide, simply contact us for a quote.



Million Mile Limited Warranty


Manufactured by



Part Number




29cm x 27cm x 4cm





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