s13mikesr20

Get a allingment with zero camber in rear so all tire is touching the floor

Better tires for the snow/rain(no all season crap)run this tire on separate wheels so you can switch in summer real easy wider tires do help but you can go only so far

Weight always helps but not to much......cause u will hit the brakes and the rear end will want to flip around

Down force would help but if ur car looks stock then u would look like a Ass

Softer setting(or stiffer depending on weight) on suspension that works with the weight that u used for the rear

Try A Apache helicopter with a flamethrower in front of it to blow all the snow and ice and water away with chuck Norris flying it so the jobs done right tehe