Unfortunately my 911 (997.2) came with the N-rated Pirelli P Zeros for Porsche. They were barely run in, (they still have the rubber whiskers!) and I only added 8,000km or so before finding longitudinal cracks around the front tires. They were made in 2013 and as such, they have now reached the end of their life. If you do a quick search, you will see posts on forums complaining about cracking P Zeros dating back to about 2001. This from Subaru, Audi, Cadillac, Ford (Mustang), Porsche and other forums. I'll be replacing with Michelins. These things are useless.