I have the same machine with a 1.5" lug track on it. Using the stock drive shaft and cogs, that is the biggest you can fit. I've heard of others using smaller cogs and being able to put in a larger lug, however, I have never tried it. My track is a Camoplast Challenger Track. I paid about $375 for it. I've ran it a couple seasons on snow and grass, no tears, rips, etc..