The main difference I noticed was that the track bends easier so it's easier to get it to go fast around the stock 6.5" idler wheels and 7" front drivers. Frees 2-3 HP on an 800 that's for sure. You're gonna carry less snow and it'll allow more snow to get through the holes instead of being processed in our tiny clearance tunnel, which here will help in the deep staff.
The only con is if you want to go through water with it but here i'll suggest get a boat and a fishing rod instead of your Hawk, you might end up with a boat load of fun instead of a crane fück...
Here's the template I made if you want to do it. Last year I did, 5/8"-1"-5/8" and worked great.
My suggestion to everyone is : just do it. Frees an HP or two, at least.