Hi,
Boy, you are really swimming upstream here. A cracked Cylinder Head isn't necessarily the product of a poor design. Over-torqueing, Coolant System issues, even driving through a cold puddle and splashing the hot Head can cause it to crack.
Porsche warranties the Head to be free from Manufacturing Defects for the life of the Warranty (like everyone else). After that, they're pretty much free from liability unless you can PROVE the design deficient and I doubt that merely a handful of examples (or even a couple dozen) would offer sufficient proof of this.
In the end, I suspect you'll end up spending the price of a new Boxster and maybe even a Lambo trying to prove otherwise, with no guarantee of actually doing so. Good Luck!...
Happy Motoring!... Jim'99
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