Thanks. I've seen that picture but I believe that it is misleading. The exhaust on the right looks like a 550i exhaust (I have that car also) because it doesn't have the curvy pipes just before the mufflers that the M5 needs to go around it's big differential.
The thread that was posted describes that the inside of the "resonator" on the M5 CP is just a pipe without resonator. Strange that it would still have the bump without anything in it.
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