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DavidXJ so I have a X6 M50i with the V8.
Not familiar with the M5 setup, but on mine, there are two resonators leading to the back box.
I had them both removed and added an x-pipe and then also removed the back-box but retained the valve. So the car sounds different on Comfort v Sport.
You could retain the resonators, add the x-pipe and remove the back-box.
EMP Performance in St. Alban's is where I had my work done.
You could also try Evolve Automotive in Luton.
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