Pecan-Streusel Coffee Cake
["1 c. chopped pecans", "2/3 c. packed brown sugar", "2 Tbsp. margarine or butter, melted", "1 1/2 tsp. ground cinnamon", "1 (27 1/4 oz.) pkg. cinnamon streusel cake mix", "1/2 c. sour cream"]
["For topping:", "In a mixing bowl, stir together pecans, brown sugar, margarine or butter and cinnamon.", "Set aside."]
["pecans", "brown sugar", "margarine", "ground cinnamon", "cinnamon streusel cake mix", "sour cream"]