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Porsche does have a set of "Approved" tires. The "N" Rating simply says the tire is of Porsche specification, However, the data or qulifications to be a Porsche approved tire is never released to the public therefore we arent really told the difference in the regular tire from the "n" rated.
I have used both approved and non approved tires. The most notable difference i find is the stiffness of the sidewalls. The N Rated tire has no flex as the others might flex a bit.
As for the warranty issue, tires are not that serious. The only part of your warranty which may become viod are for your Rims. The rest of the car warranty stays the same. They are not allowed to void an entire warranty because of tires.
I personally like sticking with the approved tires, as the dealer cant really give you trouble about warranty repairs for stupid things such as rattles, or vibrations, which they may say are tire related.
Hope this helps.
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