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I don't know anyone with an Artic Cat But 400 should be big enough with 2 variables to keep in mind HOW DEEP do you plan on plowing and HOW HEAVY (traction purposes)!
check out www.cyclecountry.com they have the implements you are looking for!
AL

I use a small disc with my atv which works well. The ground needs to be damp, not wet and it will usually go down about 4 inches. I'm pulling it with a Yamaha Big Bear.