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Z rated tyres will NOT track well in the snow. For one, they are probably wide (215s? 225s?), for two, the tread is not designed to bite into snow.
Leave your suspension alone and get some snow tyres. Blizzaks are nice, if you can find them. Grab a set of steel wheels and throw them on. Don't go wide... 185s are enough. Can you still run 14" wheels, or have you upgraded your brakes? If you can still use a 14, go with a 14" steel wheel and a set of blizzaks, and you will be wondering how you were driving in snow before.
I would also recommend getting a better rain tyre and mounting a set of steel wheels, and bringing them out when the weather is crappy, but above freezing.
Save the Z rated tyres for nice days. Tyres are designed with a specific purpose. Race on race tyres, drive in nice weather on fair-weather, tyres, drive in the rain on wet weather tyres, and use snow tyres when it is snowing. At least, if you want the most out of your car's handling... If you don't give a shit about that, e-bay the ZRs and grab up a set of S rated tyres.
The overall cost is not that much higher (after all, you are only using one set of tyres at a time), but getting them in the first place can get pricey. Now, however, is the time to get the snow shoes for your car. Worry about wet tyres and race tyres when it is raining or when it is race day.
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