My muffler SEEMED ok when I examined it externally, I replaced it because it was old, seemed to be getting louder, and the tailpipes were rusting at the seam. After removing it, I realized that it had become basically an iron oxide dust container!

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm