JD...
Does the noise disappear when the underside is wet (I know you don't take your car out in the rain...) but if you spray water - or better still kerosene - onto the engine mount / suspension / exhaust and see if the squealing reduces or - even - disappeares.
I suspect a dry engine mount or exhaust joint.......
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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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