Pre heat oven to 350
In a large bowl, mix cake mix, eggs, oil and 1 1/4 cups cold Root Beer Soda
Mix for 2 minutes on low speed until well blended
Fill cupcake liners in a cupcake tin with batter, 3/4 full
Bake for 30 minutes or until a toothpick comes out clean
In another bowl, mix Dream Whip and 1/2 cup Root Beer. Mix until creamy.
Let cupcakes cool and top with topping.