There are a ton of rotating parts on an engine, any of which could be ticking. If you are not comfortable opening the engine covers and poking around, you should really get it looked at.
A previous (non-Porsche) car of mine started making a ticking sound on the way home, about ten minutes later it spun a bearing, threw a rod and self destructed. So it's worth getting checked out.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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