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i've dyno tested a few K&N filters on a different cars, and they all showed power increases. on the 968, it made about 5hp. it is critical though that the filter be separated from the hot engine bay air in order to get that increase.
as for dirt getting in, if the filter is PROPERLY oiled, it works just fine. if it is dry, dirt gets in. most people don't take care of the filter. it has to be regularly cleaned and oiled.
no free lunch
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