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I had the same noise when backing out of the garage a few times last year then it went away and never returned.
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2018 ZLE M6: Heads/Cam, Kong Stage X Port, Katech 103MM Throttle Body, Meth, Built by CSP, Flowmaster American Thunder, NITTO 345/30R19 NT555RII 811whp
2015 CLS 63s AMG MCT7: NGK plugs,BMC filters/spacers,Labworxs Development tune 644/766 (11.22 @ 127 1/4)
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