The K&N BM-8006 is a washable, pre-oiled panel element for the BMW F800 twin family, and the manufacturer lists its application as BMW F800 2006-2018. Its media uses multiple layers of woven cotton gauze pleated for a large filtration area. The manufacturer also describes application specific seamless sealing beads and custom seals, so it drops into the stock airbox as a precision OEM-style replacement for the paper element.
Over the long run, the value is in reuse: you clean and re-oil the element at service intervals instead of buying a new paper filter each time. The manufacturer's regional spec sheet gives a re-oiling amount of 0.34 oz (10 ml). TUV Approved (Europe) status and street legality in all US states are also listed. Owners on user forums say the swap seems to help across the board, but no one has measured the gain on a dynamometer for the F800. Another forum discussion argues that fuel-injected engines meter fuel to measured airflow, so the benefit mostly shows at full throttle. Treat this as a maintenance-plus upgrade rather than a standalone power kit. Keywords: BM-8006 air filter F800ST, washable F800S air filter, K&N F800 panel filter.
Installation is straightforward on paper: the manufacturer rates it Easy and estimates 5-10 Minutes with a screwdriver. On the S and ST, however, access is more involved. Owners on user forums describe removing the upper fairing and false gas tank, then two large plastic safety clips, to lift out the intake and filter holder. The manufacturer's install guidance adds that on tray-style airboxes you should hold the air filter in place with your index fingers while inserting the cartridge into the air filter housing so it does not fall out of the tray.
The manufacturer lists the BMW F800 for 2006 through 2018, which covers the S and ST. Because application years can differ between the manufacturer's regional catalogs, confirm your model year and engine against the manufacturer's fitment list before ordering.
The manufacturer specifies a re-oil quantity of 0.34 oz (10 ml), and it designs the element to be washed and reused. Follow the manufacturer's installation and cleaning instructions for the oiling procedure and timing, and do not over-oil the element.
Owners on user forums differ. One owner reports no need to adjust, while another argues that the engine breathes exactly the same amount of air for the same conditions no matter the air filter or its condition under ECU control. Most forum discussion suggests that a retune is not required for a simple filter swap.
Plan on a longer job than the manufacturer's quoted time, since owners on user forums say the S and ST airbox sits under bodywork. Use a Torx N25 driver, a flat screwdriver, and clean hands. After removing the fairing pieces and the two safety clips, lift the intake holder, swap the element, and reseat the clips without overtightening. Keep debris out of the open airbox, and make sure the filter sits in the tray groove before closing the lid. If the lid resists, the manufacturer suggests lubricating the back of the tray with K&N filter grease or an equivalent to reduce friction.
