Help with Noise after Shutdown

[Briden]

Does anyone have any idea what this noise is after shutting down the engine?

https://drive.google.com/open?id=1KPwGWjp81fdmzNr9WL-5cHLx7AzYOMdz

The only mods are FPP Power Pack II (throttle body, CAI, and tune) and an H pipe. This issue started a few thousand miles after the power pack was added. There is no CEL and I did disconnect the battery once already to reset the ECU. :shrug:

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[Lost]

The throttle body closing.

 

[Briden]

The throttle body closing.

That bang after shut down is the throttle body closing? Can you please elaborate?

 

[Lost]

It’s an emissions thing to keep vapors from coming out after shutdown.

 

[thelostotter]

Lost is right, the GT350 throttle body will shut when the ignition is cut and make that noise. It's been doing it since you installed the power pack.

 

[Briden]

Guess it took a while for me to shut down without the radio on and finally hear it. Who'd a thunk... thank you, both!

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