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Yes, the service manager did take it for a drive but he used a full face helmet and said he didn't hear anything unusual. The helmet I use is a Pit Boss and can hear everything coming out of that engine.

I just purchased a new 2023 C400GT and about 400 miles in, the engine started making a noise while accelerating, that sound like loose metallic scraping, coming from the exhaust pipe, is the best that I can describe it. It's intermittent but annoying. I brought it to the dealer and they said to...