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Check if all spark plugs are tight (to torque spec).
If one comes a bit loose, the pressure leaks out just a bit and makes thsi kind of noise that changes by rpm - ususlly shows up only as the engine is hot / normal operating temperature.
I had same in mys Boxster few years ago and torqued all plugs - one was just a bit loose -> chirp noice went away.
If you check the plugs, make sure to re-connect the coil wires real well to the point that you can feel the slight 'click' as the wire connector is all the way home (otherwise there will be misfires).
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Boxster 2.7 2001 Manual
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