Where does this confidence come from? Well, having already found sales rising in the months leading up to January of this year, Porsche felt that the trend would continue. As it is, just over a third of its sales are derived from the North American market.
Not to say that it haven't taken steps to guard itself, though. According to Motoring, while Chrysler will be on vacation (i.e., shutting down factories for the summer), Porsche will be reducing its inventory.