I'm guessing your getting the 17" Thor's because I believe the 16" wheels come with Michelins. Anyway, the P6's are pretty average. They don't compare in any way to the Pilot Sport A/S.
I'm sure the dealer would give you an option but it'll cost you. And, others have said the Pilot Sport A/S are slightly larger in either the O/D or the width than the normal 235/45/17's which doesn't make sense but they are since those who have changed have experienced tire rub on the inside wheel well.
Pat