Coconut Sour Cream Cake

One of my favorite coconut cakes - perfect for great occasions.
Ingredients:

* 1 cake mix, butter flavor, about 18 1/2 ounces
* 2 cups granulated sugar
* 2 cups sour cream
* 1 package (12 ounces) frozen coconut, thawed
* 1 1/2 cups whipped topping

Preparation:
Directions for coconut cake. Prepare cake mix according to directions, baking two 8-inch layers. Cool completely and split each layer horizontally.Combine sugar, sour cream, and coconut; blend well and chill. Reserve 1 cup sour cream for coconut cake frosting and spread remaining sour cream mixture between layers. Combine reserved 1 cup sour cream mixture with the 1 1/2 cups whipped topping; blend until smooth. Spread over top and on sides of coconut cake. Keep sour cream coconut cake in an airtight container and store in refrigerator. This great cake is ready...