You will need a snow tire set up thats for sure. Many forum members here drive their cars in the snow, however deep snow will be a problem, As far as HP all (2004 -2007) Base and Limited Crossfires have a 3.2 liter 215 HP MB R170 engine and there a very few mods out there to produce more HP at reasonable expense. If you seek more power search for a new leftover or slightly used SRT6, 330 HP supercharged 3.2 liter MB AMG engine. Right now the SRT6 is the biggest bang for the buck, but they do not come in yellow.