Originally Posted by ben@tirerack
Can you walk in a mismatched set of sneakers, sure. Would you go out and play basketball in them? Not if you had the choice.
Agreed. Running two sets of high performing (mismatched) tires probably won't cause any issues if you drive it like a regular car. But if you track or drive it near the limits you may find it really changes how the car behaves.
You could consider buying all four and selling the rears as used.