1 Duncan Hines butter flavor cake mix
2 c. sugar
1 c. sour cream
1 tsp. vanilla
2 (6 oz.) pkg. frozen coconut

Bake cake according to directions, in 2 round cake pans. Once cooled, split cake layers to make 4 layers. Mix remaining ingredients and refrigerate overnight. Spread filling between layers, saving 1 cup of filling. Mix with Cool Whip and spread on top and sides of cake.