I have it, I used the one for the 535, its 2.5" but our oem exhaust has so many bends that it doesn't matter much, anyways, it sounds just like the video, I was gonna go with the 6 series one since its 3" but I read that the bracket mounts would be different.
Overall Im happy with mine, just some drone but you get used to it.
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2011 550i
2013 M5
2014 M5 CP
2016 550i
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