I don’t know ****************e from Shinola, but that won’t stop me from offering an opinion. I think that sound comes from the throttle body closing the rest of the way. The throttle is electronically (as apposed to mechanically) articulated, no? I’ve noticed that my car has very little engine braking immediately after closing the throttle, but the braking increases if I stay out of the throttle for several seconds, like when coasting to a stop sign. My wild and unsubstantiated guess is that rattle is a harmonic phenomena having to do with the throttle body closing the rest of the way.
Or, it could be the muffler bearings.
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