Heat oven to 350°F (325°F for dark or nonstick pans). Spray bottoms and sides of two 8-inch round cake pans with baking spray with flour. In large bowl, beat cake mix, water, oil and eggs with electric mixer on low speed until moistened, then on medium speed 2 minutes, scraping bowl occasionally. Pour into pans. Bake 14 to 20 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes. Remove from pans to cooling racks. Cool completely, about 1 hour.