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      08-10-2009, 11:53 AM   #8
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Drives: E60 M5, E92 M3, E46 M3
Join Date: Jun 2008
Location: Bedfordshire UK

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Originally Posted by niqui View Post
sorry, my original questions was wrong, i meant if i have a MS air filter or any aftermarket one, wont the gain decrease?
I have not tested this but would expect so. The BMC filter makes about 3 BHP over a stock filter on a stock M3.

This intake makes a wonderful noise though.
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