AFAIK the N-spec version of a particular tyre is a slightly different version of that tyre which is more customised during its development according to PAG requirements.
The bottom line is whether you are happy to mix 2 different pairs of tyres on your car.
There MAY be some legal/contractual issues that impinge upon your decision.
Here in the UK, OPCs expect Porsches to have N-spec cars on trade-in - they do a 111 point check when accepting a used car and it's one of the things they check for on their checklist. If the tyres are not N-spec, then I've heard of UK OPCs reducing the trade-in price in order to fit N-spec tyres. It's also a requirement to have N-spec tyres when purchasing a Porsche extended warranty in the UK.
Now, the above 2 factors (regarding trade-in and the extended warranty) apply in the UK. Since you reside in Connecticut, I think you should check whether these 2 factors (and any other minutiae) apply where you live or whether they are completely irrelevant in N America.
In addition, if your car is leased, is there a term in your contract that stipulates the kind of tyres you must use? It could be an indirect mention e.g. 'only Porsche approved parts must be fitted' etc. It's essential to check.
Other than the contractual/legal aspects, mixing different tyres is really down to safety & handling. I will leave that side of things to others here (who have greater expertise) to advise you on that.
All the best,
Easy
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997S GT Silver/Cocoa, -20mm/LSD, PSE, SportDesign rims, Zuffenhausen collection: I love this car!!!
