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      02-09-2013, 12:13 AM   #39
SpotM5
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Drives: 2013 BMW M5
Join Date: Jul 2008
Location: California

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Agree with the comments - definitely lower end improvement and slightly better sound when you remove those filters. It's a bit more responsive. Nothing earth shattering but noticeable. I remember the same with my E60 M5. When you put the charcoal filter up to light - you can't see through it. The removal was simple if you follow the directions. It took about 10-15 minutes max.
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