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I can tell you that there's a very noticeable difference in exhaust sound as it continues to break in... Its very noticeable and not a slight difference... I had a friend behind me and when we go to my house, he asked why I didn't tell him I got an exhaust - I didn't, it was same setup as before... Keller lower DPs and competition exhaust...
It's never going to sound like my e63s (or in the ops case a c63s) as merc has a whole division dedicated to exhaust where we in the roundel family are left without deep exhaust notes, although I expect that change down the road if not sooner...
If you don't want ostentatious, I would elect to do DP's and comp mid pipes call it a day... Drive it couple thousand miles and then make a decision then...
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