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      12-08-2012, 02:03 PM   #21
Enlisted Member
Drives: 2011 M3 E93
Join Date: Dec 2012
Location: Colorado

Posts: 42
iTrader: (0)

I have the Sport with Quads. Before I was simply running stock. There is a noticable power gain on the low end and a huge increase in sound all around. I am considering the valves to quiet it down for cruising around town. Overall awesome product.
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