I look at all of the air filters I buy (Chevy, Acura and Boxster..even my lawn mowers) and my filters stay clean for the most part. Maybe it because where I live and where I drive. No deserts, beach sand or dusty, dirt roads... all highway and suburbs. We have our fair share of rain which also keeps down the road dust.
Another consideration to make in your filter choice.
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My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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