good airfilter for 400EX
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Keep the stock air filter. The K&N is a good air filter, but if you ride in heavey dust it will not trap all of the fine dirt. Read the fine print on the box about riding in heavy dust. It does flow more air than a foam filter, but when you put the outerwears cover on it cut it down to the flow of a foam filter. We used to run on our R's K&N for many years but this winter after talking to some people we have changed to foam filters.
Compare the stock filter to a Twin Air and they are about the same. So stay with the stock filter . Do run a outerwears cover on it to help.
Compare the stock filter to a Twin Air and they are about the same. So stay with the stock filter . Do run a outerwears cover on it to help.
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