240 D exhaust question - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 08-23-2015, 08:50 AM Thread Starter
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Date registered: Aug 2015
Vehicle: 1975 240D
Location: Michigan
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240 D exhaust question

I'm new to benzworld, so if I'm in the wrong place with this question, perhaps someone can direct me elsewhere. I'm the recent purchaser of a 1975 240D. The exhaust system isn't original. So far I have replaced the rear muffler. For some reason, at about 50 miles an hour, there is a high pitched drone o r whine from the exhaust. This disappears at speeds above 55 mph. The front muffler (resonator?) isn't original, but I haven't found a replacement for it. Any ideas on the cause? Bob
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