Just out of interest, why can't you run Porsche N tyres on anything but a Porsche?
I've never really got a definative answer - but 'unofficially', weight distribution (engine way south of the rear axle), and that Porsche want a very specific performance profile from their tyres.
I had the misfortune of having some N rated PS2s fitted to my old S4 a few years ago - they gripped well
- but were shagged after about a 1000 miles due to not being able to take the load of the S4 V8 lump - basically worn the shoulders through to the canvass!
Very long story, but it was all down to the lies and utter incompetence of GreenFlag
- I had to get Michelin head office in France involved, who sorted everything.
I ask, as I used to run Pilot Sport Cups off the front of a GT3 RS on my track OZs.
I think when used on a track, many rules go out the window.