slip on is more bassy, but no more drone than stock IMO...my toddler and 6 month old can sleep and have slept in the car without problems..
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2019 AW G30 530e l ZPP l ZMP l ZDH
Retired: 2016 F80 M3, 2012 E90 M3, 2008 535i
Last edited by geneatals; 07-09-2012 at 10:33 AM..
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