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intermitent ticking sound when engine is hot

Engine

Model: Boxster S, Year:2001, Mileage:17000, Type of use:Street use only
I have a 2001 boxster s with 17000 miles. The runs well. When I am close to a wall or another car I can hear, at times, a ticking sound that revs up with RPM. It does not sound like a valve lifter, maybe a intermittantly loud injector. What is your opinion?

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