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I have a 2017 manual trans with the same noise. It sounds like when we put thin tube headers on cast manifold V8s in my youth. I am guessing that the sound is from the thin tube exhaust manifold. An exhaust leak is more of a tick sound. I filled with a tank of 93 octane to check if the sound is detonation and the sound did not change, so no, not detonation.

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