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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   5.0 out of 5 stars   10 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®
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

Tuesday, August 11, 2015 - Part BM-1204
Unreal shipping 1 day from California to Penticton Canada. Had to pay Fed-ex additional $10 to accomplish rapid customs clearance but no worries. As usual an excellent product. Thanks K&N

Paul Gardner
Penticton, British Columbia
Monday, April 13, 2015 - Part BM-1204
Excellent product. K&N filters will last for thousands of miles if taken care of.

Cliff Thorne
United States
Monday, December 1, 2014 - Part BM-1204
Fits perfect as all K&N products do.

Walter Sarzynski
Monday, September 29, 2014 - Part BM-1204
I finally got around to installing my new K & N air filter into my 2007 BMW R1200RT. The bike had the OEM BMW filter. I immediately noticed improved torque just off idle up to about 2,500rpm, especially if the bike was in 2nd gear just above idle. The engine used to struggle and want to be shifted into 1st, now I just crank the throttle and go! Well worth the cost for a one time purchase.  Installation was easy as well.

Denny Pink
Fort Collins, Colorado
Tuesday, August 19, 2014 - Part BM-1204
I´ve changed the filters of my motorcycle to K&N. This is an excellent product. Service and support are great.

Cali, Colombia
Monday, August 4, 2014 - Part BM-1204
Haven't got to use the new filter yet. I have had experience with the K&N products when I owned a R1150RT, both air filter & oil filters. Getting the best protection on the market is important to insure the bike runs great in all kind of conditions.

Mark Reed
Indianapolis, Indiana
Saturday, November 23, 2013 - Part BM-1204
I have used K&N filters on my bikes for the last 20 years. I've considered the filters the best protection for the engines. The best available on the market. As an added benefit when used with an after market exhaust system an increase in proformance and fuel mileage is realized. Installation is a snap and cleaning and re-oiling couldn't be easyer. As I have been turning wrenches for over 40 years and do my own maint. this is the only filter I will run in my bike and 4 wheel vehicles.

Rick Holbert
Baton Rouge, Louisianna