Many people, including myself, get a very brief rattle on start up, but if you are getting it once the car is warmed up, I would rule out something more serious. I would at least take out the oil filter to check for metal. If you have any significant amount, then I would pull the sump plate and see whats in there. Also, check the cam deviation with the Durametric for early signs of IMSB failure.
I wouldn't drive it until I checked it out.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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