Try just disconnecting the 2 x sway bar ends where they connect to the drop links & take the car for a drive. The roadholding won't be as precise as with the sway bar attached (be careful) but at least you can rule out the bushes if the noise is still there.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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