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K&N BM-0400 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   13 Customer Reviews
  • Designed to provide increased horsepower and torque
  • Pleated media provides a large filtration area offering long service intervals
  • Multiple layers of woven cotton gauze media offers excellent filtration
  • Application specific base seal and sealing bead
  • Made in the USA for over 40 years
  • Washable & reusable, pre-oiled and ready to ride!
  • Million-Mile Limited Warranty
The K&N BM-0400 Air Filter fits some BMW R1100GS, BMW R1100GS ABS, BMW R1100GS SE, BMW R1100R, BMW R1100R ABS, BMW R1100R SE, BMW R1100RA/S ABS, BMW R1100RL, BMW R1100RS, BMW R1100RS ABS, BMW R1100RS ABS Special Edition, BMW R1100RS Special Edition, BMW R1100RSL, BMW R1100RSL ABS, BMW R1100RSL ABS Special Edition, BMW R1100RT, BMW R1100RT SE, BMW R1100RTL, BMW R1100S, BMW R1150GS, BMW R1150GS Adventure, BMW R1150GS Sport, BMW R1150R, BMW R1150R Rockster, BMW R1150R Rockster Edition 80, BMW R1150RS, BMW R1150RT, BMW R850R, BMW R850R ABS, and BMW R850R Special Edition models. See vehicle applications link for details.
K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application and are designed to provide low restriction and increased performance, while providing excellent engine protection for your motorcycle.

[More Information on K&N Replacement Air Filters]

Product Specifications

Filter MaterialCotton Gauze
Height3.375 in (86 mm)
Inner WireNo
Inside Diameter3 in (76 mm)
Outside Diameter4.375 in (111 mm)
Top StyleOpen
Top MaterialNone
Air Filter ShapeRound
Package Contents1 Air Filter
Package Quantity1
Product StyleRound Air Filter
Weight0.6 lb (0.3 kg)
Filter Re-Oiling Amount0.52 oz (15 ml)
Product Box Height4.25 in (108 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)

K&N BM-0400 Air Filter Product Reviews

Wednesday, September 20, 2017 - Part BM-0400
I thought I would try a K&N filter not expecting much difference to be honest, but WOW, what a difference! More power and torque. I wish I'd gotten this ages ago, and worth the extra as they're reusable .

Royston Chapman
Sale, Manchester, United Kingdom
Tuesday, January 10, 2017 - Part BM-0400
Best service I've had anywhere. The filter is the usual top shelf product. Transformed my 04 BMW R1150 adventure from a sluggish motorcycle into a spirited ride. Power, torque and fuel economy noticeably improved. I also have K&N filters on my BMW K1200S , 80 series Landcruiser and my wifes v6 Camry, so I expected nothing less. I recommend them to everyone.

Ernie Lees
Bega, Australia
Tuesday, September 27, 2016 - Part BM-0400
I have used K&N air filters for quite a few years, on dune buggies, boats and both dirt bikes and street bike, and I have never been disappointed. Great product at a very good price.

Richard Gibbons
Navajo Dam, New Mexico
Thursday, July 7, 2016 - Part BM-0400
Living in a remote mountain town, servicing my 15-year-old BMW motorcycle means ordering parts by mail. This is one less part to re-order. I can simply clean it and re-use it. Smart.

Phil Linsalata
Arroyo Seco, New Mexico
Friday, June 17, 2016 - Part BM-0400

Klaudijo Jadric
Arlington, Virginia
Friday, June 3, 2016 - Part BM-0400
Quick shipping. My gas mileage has increased on my first ride and my engine doesn't seem to ping under acceleration.

Fullerton, California
Monday, April 18, 2016 - Part BM-0400
The K&N website is very easy to navigate. I have K&N filters in every motor I can. I feel the filters not only enhance the performance; the filters are also a good environmental product. I am not disposing of used filters. I have a 1998 BMW R1100 RT with over 130,000 miles and a 2004 Toyota Camry with over 230,000 miles that have K&N filters in them. Everytime I buy a different motorcycle or car; a K&N filter is installed if a K&N filter is available. I was glad to see you now offer cabin filters.

Dean Kohlmeyer
Garner, Iowa