Thread: COBB Accessport for a 1M?
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      12-04-2011, 05:32 PM   #39
TunedM2C
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Drives: 2016 LBB M2
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Don't get too excited about gains from adding a rear muffler. The OEM muffler is pretty hollow as it is. Most gains will be noticed when both the rear section and mid pipes are changed.
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