Get under the car and verify.
In my case, one of the rear cat heat shields was buzzing/vibrating.
All better after silencing it with a worm drive hose clamp of the appropriate size.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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