I would go with as deep of a lug as you can fit under that sled. A 1.75" if I remember right. My friend has one on his 99 MXZ 600, he also went to a 136" track. It's simply awesome. He does tend to burn up hyfax a little quicker than most if you're riding where there's not a lot of powdery snow, but if you live where there's as much snow as you say, then there's really no reason not to do the 1.75"er, unless you don't want to give up any top speed.
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