would have answered your question and this should be moved to the wheels section...
Tires are 245/35 ZR19 front, 265/35 ZR19 rear. The Michelin site might state the specs of the E46 M3 tires.
Michelin developed a special version of their PSII for the new M3, so I don't know if changing to another mfr makes sense...
Best regards, south