for the audi? i dont see any reason to. i ran basically summer tires in the Evo last winter and got by just fine
Last winter when we had the crazy ice/snow storms down in southern IL all the way up through to chicago, I drove 60mph in a completely snow covered (6 inches unplowed) lane on I-57 the whole way home. This was on summer tires in the Galant.
Moral of the story, if you aren't an idiot when it comes to braking (which no tire will help), AWD > snow tires.