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      10-27-2012, 01:34 AM   #7
Drives: BMW
Join Date: May 2007
Location: Germany

Posts: 644
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might help if you could identify whether they are cat-back or axel-back, the pricing and link the sound clips for comparison. the majority have picked the m-performance exhaust which is an axle back, so there will be no performance gains from that system.
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