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K&N BM-1204 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   19 Customer Reviews
  • 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®
The K&N BM-1204 Air Filter fits some BMW HP2 Enduro, BMW HP2 Megamoto, BMW R nine T, BMW R nine T Pure, BMW R nine T Racer, BMW R nine T Scrambler, BMW R nine T Urban GS, BMW R1200GS, BMW R1200GS Adventure, BMW R1200GS HP2, BMW R1200R, BMW R1200R Classic, BMW R1200RS, BMW R1200RT, BMW R1200S, BMW R1200ST, and BMW R900RT models. See vehicle applications link for details.
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.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.32 oz (9 ml)
Height1.25 in (32 mm)
Outside Length5.875 in (149 mm)
Outside Width3.5 in (89 mm)
Package Contents1 Air Filter, 1 K&N 1oz Sealing Grease
Package Quantity1
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)
Product StylePanel Air Filter
Weight1.6 lb (0.7 kg)

K&N BM-1204 Air Filter Product Reviews

Friday, March 24, 2017 - Part BM-1204
Extremely satisfied. Thank You very much. Best money for value.

Alberto Profeti
Albenga, Italy
Monday, March 6, 2017 - Part BM-1204
The difference to my R1200GS is unbelievable. It no longer dives when I shut the throttle off. It goes, really goes, when I ask. It must have been so stifled before. It's like K&N gave me a new bike. Cheers Gus

Gus Deadman
Gloucester, United Kingdom
Wednesday, January 4, 2017 - Part BM-1204
Great service. Parts were with me in no time at all, highly recommend.

Andrew Paterson
Paraparaumu, New Zealand
Tuesday, September 6, 2016 - Part BM-1204
I've used K&N filters in the past and never had a problem so I was sold before I bought this. This one for my BMW GSA. Truly a good, dependable product

Robert Baldwin
Charlotte, North Carolina
Monday, August 15, 2016 - Part BM-1204
Air cleaner cover was very hard to install with this filter and it seems it will be impossible to remove cover without breaking it.

Scott Berkowitz
Tujunga, California
Friday, August 12, 2016 - Part BM-1204
I have bought several K&N filters over the years. It is a cost effective replacement to the stock filter. I buy the filter directly from the K&N store to be sure to get the filter I need. The cost is competitive.

Glenn Anderson
Saint Charles, Missouri
Tuesday, July 26, 2016 - Part BM-1204
I like the secure ordering system and fast delivery.

Jamie Barros
Sparks, Nevada