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All an air filter is, as it gets more restrictive, is a governor. That assumes you will surpass its flow capacity which most who drive for mileage will never do. I seldom see anything over 3500 RPM, if I keep the filter even fairly clean and stay away from following someone on a dirt road, it could last aslong as 100k miles, if I wanted to push it. The downside is as it gets more restrictive my WOT acceleration will gradually fall off.
regards
Mech
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