I have heard that Polaris warranty is void in Canada once imported. I don't know if this is any/all warranty or if there are conditions on it being new or used. For example,
I know with Ski Doo if you buy a new sled and import it....warranty is void. If you buy a used sled over 1 year old, the warranty is transferable.
Phone Polaris USA and Polaris Canada and ask them.