i am running yokohama es100's right now, but need to replace a pair. do i have to run the exact same model tires?

 

Don't have to but you need something with very similar tread wear. I recommend buying a new set nd using your 2 good ones as emergency spares or using one to put in your trunk for a full size spare.

 

I would run all the same exact tires. You could buy 4 new ones and sell the other 2 on craigslist. Do your research on tire rack to see how much you should sell your tires for. If you bought two new tires the thread would have to be very similar and since we are awd I would suggest you do it. Unless you just bought all these tires really recent and for some reason one of the tires got messed up.

I had 4 new tires and got a nail in one of my tires in less than a month of having them. =( I patched it though and just drove em and sold em.