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      01-27-2013, 10:07 AM   #3
ForgedDistributing
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Drives: FBO N55 >:)
Join Date: Apr 2009
Location: Florida/Michigan

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From personal experience the "loud & aggressive" factor comes from pairing a catless downpipe to the exhaust.
As far as exhaust, many of us, including myself, have the best experience with the BMW Performance exhaust. It provides a rich tone and definitely throaty with the catless downpipe.