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      09-29-2012, 10:40 AM   #23
E90Company
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Drives: Car
Join Date: Mar 2012
Location: FL

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OP, I would just get a catless downpipe with the stock exhaust. This setup sounds great on the N55, and isn't overbearingly loud. It will give you the most performance, and you will hear the turbo spool much more. If you want a tad more sound, unplug the actuator in the trunk to open both mufflers at low RPM.