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      05-09-2015, 11:28 AM   #19
gclions
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Drives: 2011 550i
Join Date: Feb 2014
Location: Chesapeake, VA

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Well, mine started to rattle after coming back to an idle. So I switched it back. Not 100% sure, but it felt like there was a noticeable loss in low end torque, so even if it didn't rattle I likely would have switched it back.

Still a very cool mod if you have the exhaust setup to really enjoy it.
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