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      06-27-2012, 08:58 AM   #6
1sikbmr
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Drives: E90 M3 6MT
Join Date: Mar 2010
Location: New York

Posts: 3,258
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The factory air box on the M3 is probably the best design on the car. It has multiple points where cold air can get to the engine. Now the filter that they put is very restrictive so just a simple swap of the filter can gain some good numbers.
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