Many possibilities, impossible to tell without hearing it (video/audio).
Crazy but not really horrible possibilities:
A. Strut tower to firewall bolts are loose. There are two types. The older nut on fixed bolt needs locktite. There's a thread/post I did on this ages ago with torque specs.
B. Motor mount(s), mount bolt(s).
C. None of the above
Keep this thread updated as more info is gathered
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