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      02-01-2013, 08:25 AM   #2
b1aze
Just one more taste...
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Drives: 2010 135i
Join Date: Aug 2012
Location: Shirley, MA

iTrader: (14)

It's one of those things you can check for easily by logging. I reverted back to stock airbox after 2 different intakes and aside from the noise, I notice almost no difference in performance. I think the vacuum sound is sort of a placebo effect.