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Wow! That's a huge difference. Thanks for posting.
I can audibly hear the sound coming through in the F10 M5. It's pretty noticeable. I'm going to try unplugging and see the change, maybe I will post a vid too.
I couldn't hear the dump valve though in either VID.
On the other hand my M3 sounds marvelous at 8,700 RPM with the Akrapovic.
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