I just replaced the muffler on my '84 300d. I was thinking about doing the straight pipe thing, but I ended up having a local muffler/radiator shop do the work and it only cost me about $130 for the muffler and the labor. It looks nice all shiny and new. And, they put on different hangars which will probably last longer than the donut kind that have a tendency to wear out.

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1984 300D, 228k, Light Ivory, Java MB-Tex