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I don't use the CFM airbox, but I do use their clamp on adaptor/filter, which is the same setup as in the picture.

4 inch adaptor, same filter as a 250R. You can pick up a spare filter for about $20.

I am well pleased with mine. :thumbsup:
 

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I'm anxious for some more input, I was looking down the road to get one myself.. :thumbsup:
 

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Not a bad price...and the 4 inch inside diameter has got me curious!

Dont know if its better than the stock airbox with the prodesign 3.5 inch opening all the way threw though? Who knows
 

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No matter what size inlet the air filter is your still restricted by the size of the factory snorkel which is about 2.75" I.D. and where it necks down to the size of the throttle body 2-2.125" I.D.

I dont think theres anything wrong with it, but I wouldnt sell my PD adapter with 3.5" inlet filter for it thinking id get any more power out of the 4" setup.
 
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