Cinnamon Pound Cake

1 (18.25 ounce) box yellow cake mix
1/2 cup granulated sugar
1 (8 ounce) container sour cream
4 eggs
3/4 cup vegetable oil
2 tablespoons vanilla extract
4 tablespoons brown sugar
2 tablespoons cinnamon

Mix cake mix, sugar, sour cream, eggs, oil and vanilla extract well. Pour half of mixture into a greased Bundt pan. Mix cinnamon and brown sugar, and sprinkle over batter. Pour remaining batter on top. Bake for 1 hour at 350 degrees F.