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The issue with the stock airbox is the lack of adequate sealing around the primary filter. So no matter how good of a filter you put in, it will still pull air from around the primary filter. So ALWAYS make sure you run your post filter. You will see how much dirt it actually catches! I think the stock setup filters great only because of the post filter. So just make sure you inspect and clean the post filter as needed and you will be good to go.

Also, don't think that throwing in a K&N or other filter that you are going to increase airflow to the engine......the restriction is in the inlet pipe and the post filter. So there is no real benefit to changing your filter....
 

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Good point.
You can also use some grease on the seal of the OEM filter to help stop some of the dirt that gets by the seal.
I tried that and didn't notice any difference as my post filter was still very dirty after one ride......I do live in the desert though and the dust is like silt....(very fine particles) so it may just be that the stock primary filter can't stop particles this small....

I am running the TurnKey Race intake with the K&N now and haven't noticed any dust getting past the filter but it hasn't been too dry out since I installed it so I will probably not be able to tell how well it filters until next spring/summer when it dries out again and the dusty conditions return. I may switch to a dual stage foam filter if the K&N doesn't do the job.
 

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I like them. I like the ones that come with a thin foam prefilter that goes over the main foam filter
X2...UniFilter makes good stuff. So does TwinAir and AFE.
 
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