Preheat the oven to 350°F. Grease your pan(s). You can use a bundt pan, 9x13 pan or a couple of 8- or 9-inch round pans.
Mix together the cake mix, eggs, pudding mix, oil, zest and orange soda in a large bowl with a mixer until fully incorporated.
Pour the batter into the pan and pop it in the oven. The bundt pan required about 35-40 minutes, while the other pans would be closer to 25-30 minutes.
The cake is done when the top is lightly browned and a toothpick inserted in the middle comes out clean. Another good indicator is that when you touch the top of the cake, it should spring back.
Remove from the oven and let cool completely.