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Old 01-03-2013, 06:12 PM
Roundel-NY Roundel-NY is offline
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Location: New York
Join Date: Nov 2012
Posts: 24
Mein Auto: 2013 X3
Backpressure. Don't know if you will gain anything by going with an aftermarket muffler. Maybe a slightly different exhaust tone. Won't be any noticeable power gain. Some have unplugged the vacuum hose and made the butterfly valve open at all times. You can try that, see if you like the results.
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