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      01-22-2012, 07:02 PM   #4
DylanMckay
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Drives: e92 m3
Join Date: Jan 2012
Location: armpit of the USA

Posts: 122
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Gruppe M or any intake for that matter does not add any sound on this car. It is the high-flow cone filter that gives you extra sound, which you can do with the stock box. The OEM box is already opened through the top of the hood and thus lets all the intake sound out through there, making it quite aggressive! Also the OEM filter size is already HUGE and with a oiled free flow filter you will have all the benefits of any aftermarket intake.
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