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Discussion Starter · #1 ·
hey guys just curious as to what you all would recommend for a 08 400ex for an after market air filter i have been look at the k&n and the uni filter but i would like some input on what you guys prefer to use
 

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Welcome to the forums. Since I don't have a 400EX, I can't really help you with your question, but someone will be around shortly that can help you. We have quite a few guys on here with the 400EX.
 

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k&n im assuming the uni is a foam filter, the k&n in my opinion flows better i run a k&n on mine, not one complaint
 

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i have the K&n powerlid and the filter set up on my 05 400ex and i would never go back, no complaints and good power increase will need to rejet though
 

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True K&N flows more air but in turn in also lets more through. Depending on what kind of riding you are doing I would go with UNI. If yu race and are on conditioned tracks where there is less dust, K&N is great.
 

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if you had a k&n and repplaced it with a uni foam would that cause you any troubles?
 

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I run a uni filter just because of the conditions I ride in. I ride in a real dusty area. the k&n flows better but it also lets more dirt by. I would rather have my motor breathing clean air. than have that half of horsepower. just my 2 cents.
 

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Discussion Starter · #8 ·
thanks guys i usually ride on dusty trails or at the snow shoe rails to trails in pa and its all coal dust there so i think the uni would prob be my best bet thanks for all you input
 

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if you had a k&n and repplaced it with a uni foam would that cause you any troubles?
No, it is a small enough difference that you won't have to rejet.
 

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NoToil is another good brand. I have a Uni and a NoToil, I switch back and forth.
 

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