The filter is developed on the track , NOT on a dyno but in real life.


MWR Race Filter KTM RC390 this filter is developed/designed for racing on the track , NOT on a dyno but in real racing situations. No different fuel-mappings between cylinders are needed.  It makes the bike stronger but smoother. To make more power from the same motor, you have to flow more fuel and more air.  The thin, lightweight,  MWR foam race air filter flows more air than any other filter on the market.

Please note that the  MWR Race Filter KTM RC390 filter flows more air compared to the Performance filter and needs to be maintained more often. It is recommended the Full Race Filter be checked and maintained after each race weekend

Unleash potential power in your engine with the MWR Performance Air Filter. Designed to flow more air while also providing high quality engine protection, the Performance air filter is specifically crafted from MWR’s exclusive material to out perform the KTM OEM filter it’s replacing. This washable air filter comes pre-oiled with biodegradable air filter oil and is ready to install directly out of the box, making this a simple and easy way of increasing your KTM’s performance on the street or at the track.

MWR Racing has been creating and developing air filters for almost every racing application for the past 20 years. With experience in Moto GP, SBK, MotoAmerica, Dakar, and much more, MWR Air Filters have stood on top of podiums across the world. Don’t let the pro’s have all the fun, get the same air filters used by top factory teams and unleash your KTM RC390 power

Spears Racing Velocity stack designed air filter lid:

Spears Racing has done it again along with the engineering team at Corbin Custom Design, here is the newest way to create more power from your KTM RC390.The newest design will allow the fullest amount of air into into your engine for both street and for racing (only to be used with the MWR Filter).This design comes from the technology of the Spears Velocity Stacks, to speed up the air intake into the air box with not obstructions.(Comes with Mounting Hardware)

Spears Racing has been designing and making race products for decades, their continuous committed to excellence to advance as the industry changes. This commitment has resulted in more components specific to certain applications, proprietary products only manufactured for us. Each of these aspects has been put through stringent research and development stages to ensure that our product will exceed your standards.