The only reason you can see the dirt on the foam filter elements like HKS and Blitz .. is because you can knock them of the filter as they get stuck in it ... but you can't do that with the cotton K&N filter .. so if they suck the same amount of dirt you can't tell because they go right through into the engine ... That's just a thought ...
Matt 91TT Aztec Red stg III+ "Married men live longer than single men, but married men are a lot more willing to die".
 wouldn't you guys love to die in her arms !?
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