I'm an idiot for not thinking of this sooner... If it happens while not moving, get someone to rev your car to 5k while you stand to the SIDE (safety first) of the open engine bay and see if you can find what's wrong. Sometimes it's hard to isolate an engine bay noise from the wrong side of the firewall.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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