Do you have to drive it or does it do it when it sits and you hit the throttle too... could be a loose plug (yes they make that kind of noise) or you have a pulley/bearing that's chirps.
Checking the plugs is a bit of a pain because you have to pull the coils out, but I'd check that... if they're all tight, take the belt off and see if its gone... careful though dont run it too long the water pump is on the belt...
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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