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Item 1: that could be the air/smog pump which only is engaged for about 60 seconds after start up.
Item 2: that could be from the sound generator which pipes engine noise into the cockpit. You may have a vacuum leak sound and that's being piped r into the cabin. Check the engine for vacuum leaks have a friend sit in the car and rev the motor while you listen.
Item 3: that could be the rear anti-rollbar. Those are known to come loose so I checked the tightness of the suspension components.
Those are my best guesses. Noises are very hard to dx via descriptions alone.
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