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I did this last night. Took maybe 10 mins.
I have stock CP exhaust and the sound is quieter but better. It doesn't sound like GranTurismo anymore and you can even hear the burps and farts better.
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2007 E92 335i / Montego Blue/Black - European Delivery - Retired
2013 F10 550i / Alpine White/ Cinnamon - Retired
2014 F10 M5 / Singapore Gray/ Sakhir Orange - Retired
2016 F15 X5 XDrive50i / Black/Black - Current
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