the reality is that you should be asking this in a tarmac rally forum, not the wheel and tire section of an FRS forum.
maybe find a Finnish forum and ask them what they scoot around on in their areas.
in fact, a quick google search for wrc winter tarmac tires brought me around to this little gem. So go nuts.
http://www.tirerack.com/tires/tires....nter+Sottozero