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      11-28-2012, 09:25 AM   #3
gatorfast
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Drives: 528i M Sport
Join Date: Jan 2008
Location: SoFla

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I was in the same position as you and decided to remove the secondary cats which ended up being perfect. It added a noticeable increase in volume and a more aggressive sound but still no drone. It does sound a little raspy however so if you hate rasp I would recommend leaving the oem mod alone.