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135i air filter replacement DIY...
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09-17-2011, 11:02 PM
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delta-9-ginseng
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Drives: BMW 135i & F36 435i
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So placing a K&N air filter instead of the OEM BMW one would result in a possibility of inducing engine damage via sand and stones getting in? I thought the K&N air filters increase air flow ever so slightly...
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