I have a 2008 G37s, running michelin Pilot Super Sports. The fronts need replacement, but Michelin has replaced the Super Sports with the Pilot4s. According to Tire Rack, Michelin "...does not endorse" matching the 4s with the SS. I think they would just rather sell 4 tires than 2. But, do any of you have experience running Super Sports on one axel and 4s on the other? Would that be ok? I really don't want to buy 4 tires right now, when the rears are still just fine.