Summer tires-absolutely would not recommend. I have fairly new high performance summer tires on my Z and it is worthless in any snow. I seriously can't make it up many streets in town that are snow covered. And that is not the scary part. I can handle the Z being squirrelly in the rear end, but when you lose steering/braking abilities it becomes too dangerous. With summer tires you haven lose a good amount of braking ability, and I definitely wouldn't take the corners (normal speed) as fast.
