Join Date: Dec 2012
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You may find these links interesting...
Air Filter Test
Air Filter Filtration Testing
Someone tested various air filter tests in their Miata. The filters tested included stock and K&N. The testing included a filtration test in which they installed a second air filter downstream of the main air filter to see how much dirt it collected. The first link has the introduction and summary or results. The second link has more details on the filtration test.
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