This happened to me. My 300D muffler and exhaust pipe were rusted with holes (both were original). Went to a muffler place on Capital Blvd and they had everything in stock - paid less than $200.00.

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JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!