This is mine, 75' 280SL, 2, Porter resonators into a Flowmaster. Had tried glass packs but it had that characteristic inline 6 cyl. bark. Has a cross over for the A/F sensor. If you want to be envious, check out the "Leno's Garage" video featuring Steve McQueens XK-SS.
https://www.youtube.com/watch?v=4Ai0uSj_OVE That is the best sounding inline 6 I ever heard. Wish I knew how they did it. Must admit it was fun flooring mine while going down the street and setting off car alarms