1 box yellow cake mix (without pudding)
1 sm. box instant vanilla pudding
1/2 c. Pepsi
1/2 c. oil
1/2 c. water
4 eggs

Grease a bundt pan. Mix cake mix, pudding, pepsi, water, oil and eggs. Beat 2 minutes then pour in pan. Bake at 325 degrees until done. Add:

1 c. brown sugar
1 stick butter
1/4 c. Pepsi
1/4 c. water

Boil 2 to 3 minutes. Pour over hot cake while cake is in pan. Let cool and turn out onto cake plate.