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      05-16-2012, 08:04 PM   #2
mojo_78613
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Drives: 2011 BMW 1M Coupe
Join Date: Apr 2010
Location: Cedar Park, TX

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I had mine installed about a month ago. Thus far I'm very happy with it. Sounds a bit deeper. I haven't put in a lot of miles since I had it installed, but I assume it would get better with more miles. Performance-wise, a bit more free flowing than the OEM. No hard figures for HP and torque, but generally around 3 to 5% increase from what I heard. If you search YouTube, you will find a video that one member posted showing before and after... Cheers!