I personally think the "N spec" is overrated, it supposed to be Porsche Approved. I think its just a marketing thing, to make Porsche owners pay extra money for the "N spec" letters on the side of the tires.

I had Bridgestone RE050A on my bimmer, its not bad tires. But I find the Michelin PS2 grip a lot better for aggressive street driving, the Goodyear F1 GSD2 tires, they are great, feels more stable in heavy rain then the PS2 and superb dry grip. I would recommend looking at the Goodyear F1 GSD3 tires, they are cheaper then the PS2 and grip level is about the same if not better.

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07 Cayman S - 6 Speed l 03 M3 - SMG l 07 Ridgeline