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On Tuesday, we posted an audio recording of a mystery car's exhaust note. To hear it again, click play above. A lot of those who commented guessed that this week's sound was from an AMG Mercedes-Benz, when in fact it came from a 2012 Porsche Panamera Turbo S. Only a few of you identified it correctly. Hit play for an audio recording of a mystery car's exhaust note, and then share your guesses or get a few hints from other visitors in the comments below. Be sure to check back on Thursday for the answer! 2012 Porsche Panamera Turbo S blog.caranddriver.com (Right-click to Save As...)