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      02-16-2013, 08:19 AM   #4
CanAutM3
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Drives: 2015 M4 DCT
Join Date: Jan 2012
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2015 BMW M4  [4.10]
2006 Audi S4  [0.00]
You mention that you changed the OEM air filter for an AA unit. This will definitely change the sound of the intake. It will be louder and raspier, especially at full throttle.

You might want to double check if you installed your filter right and that the airbox is well sealed.