Log In / Register
Cart (0) Checkout
K&N Air Filter BM-1204
Select qty:
Your Savings (10%):
Your Price

K&N Air Filter BM-1204

K&N Air Filters are designed to achieve a virtually unrestricted air flow while maintaining filtration levels critical to engine life. The secret to their success lies in the unique characteristics of the filter medium which was originally developed by K&N all those years ago in the dust, sweat and tears of desert motocross racing.

The high flow cotton gauze air filter is washable, reusable and built to last for the life of a motorcycle engine. K&N air filters consist of four to six sheets of cotton gauze layered between two sheets of aluminum wire mesh. This media is then pleated and oiled to enhance its filtering capabilities and overall performance. K&N Air Filters were created for an environment requiring maximum horsepower and enhanced acceleration in addition to protection from the dirt and dust. The result is an air filter that allows dramatically more air into an engine, is washable and reusable, and will protect your engine for the life of your ride.

This Product Fits:
HP2 Megamoto 2007, 2008, 2009, 2010, 2011
R1200GS 20042012
R1200GS Adventure 20062013
R1200GS HP2 2006, 2007
R1200R 20072013
R1200RT 20052013
R1200S 2006, 2007, 2008, 2009, 2010
R1200ST 2005, 2006, 2007
R900RT 2005
Write a Product Review for a chance to win our monthly $100 giveaways.
KN Air Filter BM-1204 4.8 5 10 10
BMW GSA K&N filter - easy upgrade I've used K&N on so many different vehicles of the years and they continue to be super easy to install, clean and use. They provide a marginal performance improvement, but I mainly like them for their durability and re-usability. June 2, 2014
Bike is like new Swapped out the original OEM filter on my 2010 deauville and the change was immediately noticeable. The engine pickup was improved and the engine sounded like it was breathing more cleanly. The original filter was rather dirty even though I have 9000 miles on the bike, probably because I ride in the city 90% of the time. I haven't had it long enough to comment on the long term qualities of the filter but having a lifetime warranty gives me piece of mind. The ability to clean a reuse it is a great feature as well, saving the environment and my bank account. July 7, 2014
Good choice for OEM replacement I have over 1000k on the filter and so far all good. No engine light and no other issues. The filter fits perfectly and it's easy to install. As a previous K&N filter user I truly believe that this filter is a good bang for the buck. OEM filters are very expensive. May 12, 2014
One of the cheapest, effective and simple to install mods. You will notice a difference in performance with this filter installed, it's not dramatic but for roughly $75 it is worth it. Given that it also has a lifetime warranty (KEEP YOUR K&N WARRANTY STICKER!!) it seems like a no-brainer to me! PS: You can install this without any extra tools, you only need that little toolbag that comes with your bike incase you are short on tools. June 18, 2014
K&N Air Filter The K&N air filter imo is well woth the extra coin over the OEM paper filter. Istallation was easy, only took about 45 min. start to finish even being the first time I have replaced the filter on the Speed Triple. I did notice a slight increase in throttle response but not sure if that is the the quality of the filter or due to the bike breathing better since the filter is brand new, the original OEM was pretty filthy upon inspection. May 27, 2014
Makes a difference I had low expectations, but it makes a very clear difference. March 10, 2014
Excellence as expected from K&N Installed on my 2013 Tiger 800xc. The difference in power and throttle response is immediately noticeable. March 3, 2014
Good stuff I was surprised at how much the air filter was, but its not so bad taking into account it'll last the life of the bike. I noticed better throttle response on my bike after installing. January 30, 2014
2 next>>
Use our Product Q&A for a chance to win our monthly $100 giveaways.

Have a functionality, fit, or otherwise product-specific question about the K&N Air Filter BM-1204? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

K&N Air Filter BM-1204
Already Asked: 1 Question, 1 Answer
Sort by:
RevZilla Store asked: Why did you choose this?
Salvador V: Have you guys seen the uber expensive prices of the BMW OEM filters? One filter purchased for the life of the bike works for me. Plus the quality on K&N filters is top notch. Apr 23, 2014
Product Style RevZilla SKU ID Manufacturer Product # Availability
K&N Air Filter BM-1204 857841 BM-1204 Available: Usually ships in 1-2 business days