Kawasaki EX400 MWR filter 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 Kawasaki EX400 MWR 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