MWR Race/Street Air Filter Kawasaki ZX400RR


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




MWR Race Filter Kawasaki ZX400RR 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 Kawasaki ZX400RR 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

The HE (High Efficient) air filter (MC-040-20-HE) for road & race bikes

The revolutionary HE Air filter increases power and reduces intake noise. Unlike any other sports filter all inlets will get the same quantity of air, regardless of the speed of the motorcycle or wind directions. This is because of the unique design of the Air Splitter Plate (see illustration to understand how the Air Splitter works) and how it evenly distributes air throughout the airbox. No different fuel-mappings between internal & external or front & rear cylinders are needed. Clean and re-oil once a year.

Kawasaki ZX400RR (MC-040-20-R) Full Race filter (black)

MWR developed the Full Race Filter for riders looking for the best out of their H2 when participating in drag racing or trackdays.  They offer the best air flow possible from such a small filter.

The MC-040-15-HE has a printed logo on the front of the filter as indication of how dirty the filter is. The filter will be dirty very quickly (just like all other airfilters for this bike) because of the small size of the filter.  It is very important to keep this filter cleaned and oiled regularly to protect the supercharger bearings.


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 the Kawasaki 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 Kawasaki’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 Kawasaki Ninja 400 power

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.

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