Question about air cleaners

[K-Dub]

I see where people want to get rid of the metal cage/screen inside the stock filter. Does the Uni and or pro design have a different way to keep the air filter from collapsing. When I look at the pictures of both kits I do not see a cage of any type. The 250R and the CR250 have a plastic cage that keeps the filter from collapsing. Also will the stock 250R cage fit the air cleaner and intake on the 450R. What about Twin air air cleaners, this is what I ran on my CRs and 250R. I see noone even talks about Twin Air, why is this?

[jak1389]

they dont have cages inside them.

[asdf450r]

i run a uni and it does have a sort of expanded metal cage inside it, very breathable.

[Airik79mx]

The Pro Design also has a cage.

[troutman561]

i also run a uni, it came with a more open cage

[K-Dub]

So will the 250R cage fit the 450R intake? Its plastic instead of metal.

[cals400ex]

with the sparks filter and their billet ring, you do NOT use a cage.