[n4ally2]

I called up my local porsche parts dept yesterday and they explained to me that N rated tires are tested and approved by porsche. When they first tested and approved the tire, the tire manufacturer will put N0 on the tire. When the manufacturer makes any changes to the N0 tires, they will then call it N1 tires. So it is basically different versions of the tire. So to answer eslai, I best guess is the non N rated PS2 are prior to the prosche approval.

Now, get this: Porsche does not know the difference between N0 or N1. So I really questions how much does it really matter to have N rated tires or not. Maybe it is just a market scheme.