air box mod

need to know where I can get peices to modify air box on yz400. K&N filter, air inlets, or has anybody taken off air box a used just k&n filter. we flattrack.

slip a air box from a 96-01 yz 250 2 stroke they breath muuch better

Whats different about the YZ 250 air box that lets it breath better? Also isnt it white?

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