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      10-16-2012, 05:51 PM   #8
3002 tii
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A more "breathable" filter over stock won't do much anyway so I think you should stop stressing. '

In fact, I didn't even remove the charcoal filter (despite being a popular mod here) because BMW stated it could cause rough idle or worse mileage on the s54's.

http://bimmerfest.com/forums/showthr...54#post2878954
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