Place 16 fl oz (2 cups) water in mixer bowl; add total amount Krusteaz Professional Cinnamon Streusel Coffee Cake Mix.
Using a paddle, mix on low speed 2 minutes. Continue to mix on low speed 1 minute while gradually adding balance of water. Scrape bowl and paddle.
Add peaches and sour cream. Change to medium speed and mix 2 minutes.
Divide half of the batter between three, prepared 10-inch tube pans (23 1/2 oz batter each pan).
Sprinkle 5 oz (1 cup) streusel topping over batter in each pan.
Scale remaining cake batter into pans (23 1/2 oz batter each pan).
Sprinkle remaining 5 oz (1 cup) streusel topping over batter in each pan.
For convection oven, bake at 300°F 55-60 minutes; for standard oven, bake at 350°F 55-60 minutes; or until toothpick inserted into center comes out clean.