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The free flowing air filter is "achieved" by letting air in through larger openings in the filter element. Both Consumer Reports and Road and Track (IIRC) did tests several years back and the K&N let in more dirt and bigger particles of dirt than stock filters. While these may not have been Boxster based comparisons, the results from two sources with no axe to grind made me a believer that I shouldn't use the K&N.
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