Michelin Tires for 2003 Porsche Boxster
 

I have been running Pilot Sport PS2s on my Porsche, but want the added capability of light snow driving, so I am considering getting Pilot Sport A/S Plus tires. However, at this time, I only need to replace the rear tires. Is there a problem with running PS2s on the front and A/S Plus on the back until I have to replace the front tires?

While not ideal to run different tires front to back, you can get away with it until your front tires need replacement as well.