Answers: it sounds worse than pinking to me, most people cant even pick out when their sports car is doing that.
i would guess at something like a loose engine mounting or even the bubble joints going.
it could be something as simple as the wheel need realigning, or you requirement new tyres.adjectives these things can produce dodgy rattles!
any way, obtain it checked out
change down a couple of gears and maintain the revs up, does it still do it?
If not then you are pinking , zilch to do with your engine, catch an automatic or learn to use your gears.
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