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OP - Thank you for the write-up and detailed report. Those gains are very significant!
Do you have any exterior video of the car from the rear?
I am trying to decide what solution is best to *slightly* increase the exhaust note of the car. There aren't many videos out there of X-pipe only M3's without some form of aftermarket rear muffler section.
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2009 E90 M3 DCT
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