Is it actually rpm related, or speed related? Try getting it to flap, then up-shift but stay at the same speed. I'm guessing it's speed related, and you've got a loose plastic undertray (like stated above). Mechanical noises are usually whines, grinds, knocks, squeals, etc... not flaps.
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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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