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      11-28-2012, 09:17 AM   #2
gatorfast
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Drives: 528i M Sport
Join Date: Jan 2008
Location: SoFla

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The OEM mod is independent of any cat/resonator mods so no reason you cant do it. As for things to consider...the increase in volume will be substantial compared to simply removing the secondary cats and resonators with the stock rear section and the resulting sound will likely be very raspy.