clearly best option would be take radiator out and either repair or replace. not an easy job on the Boxster as mid engined and have to get to it.
What year Boxster is it ?. The 996's had a low level coolant light and is very sensitive. Prevoius posters have given pitfalls of running short of water, sound advise but maybe not in the way you wanted to hear.
Have used Barrs Radweld long time ago, it cured a slight leak in a Citroen AX, might be worth what ever a bottle costs now.
Any problem on a Porsche is likely to cost you money, don't understand numskulls who go about vandalising what they see as posh cars just for the sake of it.
Good luck
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