Preheat oven to 350 degrees
Generously butter and flour bottom and sides of all three baking pans.
In a large bowl mix sugars, and oil until combined. Add in eggs and mix just until combined.
In a medium bowl mix flour, baking soda baking and powder, cinnamon, cayenne, salt and nutmeg
Add the dry ingredients to the wet ingredients and mix just until combined. Fold in carrots and pecans
Divide cake mix into the three cake pans.
Bake 25 minutes or until toothpick comes out clean
In a large bowl add softened cream cheese and butter. Using an electric hand mixer, mix until light and fluffy. Add in sifted powdered sugar about 1/2 cup at a time and mix until incorporated. Add in vanilla and mix until combined.
Place one of the cake layers on a cake stand or platter and top with about 3/4 - 1 cup frosting. Smooth it out and place another cake layer on top and repeat.