Thread: Quick question about air filters
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Old 05-26-2011, 10:01 PM   #14 (permalink)
tjts1
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BMW E30 air filter tests

Filtration Testing for Amsoil, K&N, Napa, Jackson Racing, Baldwin, and Mazda air filters on a Miata

http://www.fueleconomy.gov/feg/pdfs/...02_26_2009.pdf

Cliff notes:
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