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This is related to piston slap. When the engine warms up the noise should go away and be near silent. Some early production '02 models had an issue with cylinder sleeves slipping and there is an extension of warranty to 100,000 miles for certain VIN's.
The sound has also been related to cold carbon knock. A can of Techron put into a full tank of fuel has been known to help a lot.
Many members of our enthusiasts website report the same sound and have reduced it significantly by doing the aforementioned fixes. The use of synthetic oil and top tier fuels have also been associated with quieter smoother running engines.
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