Hello there,
Mine had a similar sound, it would show up every time I blipped the throttle aggressively from idle while in neutral. Kinda a thunk or clack sound.
I bought the new gaskets to fix it from our host (dirt cheap by the way). I went to replace them, only to find that the job is super simple & fast to do.
Pop off the intercooler, pop off the top section of the intake (3 bolts, several hoses, couple of wires). Take off the 8 little nuts on the cover plates(watch out for the spring tension it's pretty high) and there are the offending gaskets.
In the end, I simply changed out the gaskets and the noise went away, and then decided to completely dead end the whole system, but that's another story.
Mark
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