Installed Innotech IPE exhaust system on my 2014 M5 competitive package, it was either IPE or AKRAPOVIC, i didn't see that many vids on the net, searched about the IPE and asked around and finally after research I've bought the exhaust system.
It has a unique sound and it can get very loud, the good thing about the exhaust it is F-1 based exhaust it gives you the adrenaline to race lol.
here is my video link
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in the vid you will be able to hear the start, acceleration from stop 2 times, and downshifts.
feel free to ask any question, ps installed more things as well, feel free to ask.
taking it to European auto source this week to see how many whp the car has, and hope to see you guys in Shift s3ctor.