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We run K&N w/ a pre filter in normal conditions, foam in extremely dusty or muddy conditions.... I think the foam stops dirt better , but the K&N makes more power on the Dyno.
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My son is a proven ATV MX champion rider
2009 Can-AM DS 450 XMX, Fox evol 2 fronts and fox rear, Custom motor by Williams ATV performance, motoworks exhaust , BCS intake..
2008 DS 450 Frame: removed all Rivets, modified front frame pieces,BCS frame support kit, replaced all bolts with metric fasteners,ENGINE: Custom Engine build by Williams ATV Performance, BCS intake,SR4G2,x factor nerfs and heels, PEP custom front and rear,Holz A-arms BRP race pkg
more every week 
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