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I replaced the tank last year, in my 98 Boxster. It still "looked good" BUT due to age it developed tiny spider cracks on the bottom that would expand once the hot coolant began to circulate. At first the coolant level would hardly drop but the longer I drove the more it would leak. The coolant never touched the carpet so I had no idea I had a bad tank until enough coolant collected UNDER the raised trunk floor and found it's way to my garage floor through a seam or rubber grommet in the metal trunk floor.
My "indi" Porsche mechanic replaced the tank and hoses and clamps with genuine Porsche parts and charged about $875 for the whole job. I don't have anyway to lift the car and work from underneath nor do I want to do the work myself even if I could. My 98 has been trouble free this long so I didn't mind spending the money to have it done by someone else.
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