[rdancd816]

Mixing tires in that manner is not a good idea in terms of performance enhancement. Both brands you are evaluating are fine but overall performance will be compromised if mixed. This tire discussion could go on forever...I use Bridgestone Potenza SO-2A's and the wear and performance have been fine for my taste. They may not look as cool, as the tread pattern is not too agressive...but they are Porsche recommended and approved. Good hunting!