Originally Posted by spearfish25

That will give you minimal improvement in performance and then make it impossible to rotate the tires around the car to lengthen the lifespan of the snow tires.

Having used a snow tire setup on the Z last winter, I'd suggest you throw any performance notions out the window. I don't care what width or stagger you run, your car is no longer a performance vehicle with snow tires on it. Save yourself some cash down the road and get a setup that will allow you to rotate the tires around the car and get the best bite possible in snow (narrow and square...I went with 225 all around). If you don't like how the rear tires look (too sunken in), you can always run some fat 25mm spacers in the rear during the winter. Also, get 18" rims to save yourself the cost of buying 19" winter tires. Tire Rack has a nice selector which will give you plenty of options with or without the sport calipers.