400EX Air Box
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It keeps out alot of extra dirt and mostly it's for water and mud and junk like that. PLUS if something like stick should fly up and hit it the box will prevent the filter from getting torn or worse ripped off. If you just race or dont ride in dusty conditions without water/mud then you should get a kit that sells for like $30 and it remove the airbox, so theres just a filter. It will give you more flow.
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