My Pro came with the Camso Extreme, and I've been pretty happy with it. It's modified slightly: the outer lugs are cut down 1/4" or so, to improve snow evacuation as I understand it. The biggest downside I know of with that track is that it's pretty heavy, especially compared to the 2.6. I've heard several reports of diminishing returns on AXYS sleds with too tall a lug, so a Pro or iQ with 8t 2.86 drivers will definitely hit a wall trying to go taller. Not sure how much losing the front cooler helps with that though. If you found a good deal on a 2.6 (less likely than on a Camso or 2.4), I'd say go ahead and try it. Of course, even if the front isn't an issue, it may still rub the underside of the tunnel. If that's an issue or the tunnel packs up, you might be able to trim the lugs to help. It doesn't seem like something I'd pay extra or go out of my way for, but it wouldn't hurt to try,