Has anyone looked into putting parts of the E63 exhaust onto the E55's. The response from the dealer was that nothing was interchangeable, but that seems to be their go-to response for most questions. Would the mufflers account for most of the sound differences, or are there other changes upstream that would also need to be made? I would love to have that sound, or possibly that of the SL55.

I tried a search and came up empty, so if this has already been covered, I apologize.