I agree with scuzz. However will give you facts: K&N will flow better even with outerwears than the foam. How much more? I have seen tests that show 0.5hp in more power. Not worth it in my opinion. It really comes down to how dusty it is where you ride, if too dusty stay away from K&N (made of pressed cotton by the way, not paper) if not too dusty or only sand then go with K&N as it flows better and easier to clean too.
2006 Raptor 700
Yoshi RS-7 full, PCV, Pro Design Foam, EHS lid, Flexx bars, 2" Rox antivibe risers, ASV C/5 levers, Powermadds, CCP stabilizer, HDUSA i3500 +2 a-arms ST, Rap 700 SE front shocks revalved/resprung by Wiigstyle, Fox Podium X rear shock, DWT Drift rear beadlocks, Hiper front beadlocks, Pro Armor XC nerfs and Race grab bar, Tag Agro bumper and railer chassis skid, PRM 0.25" swingarm skid plate
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My name is Iņigo Montoya, you killed my father, prepare to die!!!