You can't tell me a rear wheel drive car thats 2-3" off the ground is ment for winter/snow driving
not only that but there's no way your Z with a winter setup would even come close to my beater (97 pathfinder 4x4) in bad weather! IMO leave the Z stored all winter.
Unless you are in BC they don't get much in the way of snow or even cold like the rest of Canada.