You will need to change drivers like you said, so track pitch isn't really an issue. Since you'll be putting extros on (they are neccessary for anything north of a 1.325" track in my opinion), you can choose whatever pitch drivers you want, therefore, you can use any pitch track you want. As for lug height, to go with 1.75" and bigger, you need to remove the tunnel protectors which are aluminum and riveted on the Yami's. It's a pain, but with a grinder and a steady hand, it's not too bad. After that, you need to determine what lug-height track you are going to settle on and then purchase drivers that will allow that. With stock diameter drivers, 1.75" is about as big as you can go (with the tunnel protectors removed of course), past that, you will need to get a driver that is smaller in diameter to give you more clearance from the front tunnel cooler. There's a ton of info on here concerning track swaps for the XTX (because the stock Ripsaw is so crappy in deep snow)... just search around! good luck!