Pistachio Cake with Chocolate Tunnel

1 yellow cake mix
1 small (3 oz) box instant pistachio pudding
3/4 cup oil
4 eggs
1 cup sour cream
8 oz. Hershey's syrup

Mix cake mix, pudding, oil, eggs and sour cream.

Pour 2/3 of the batter into a greased and floured bundt pan.

Add chocolate syrup to the remaining batter. Form a canal in the batter and pour the chocolate batter into the canal (this will make a chocolate tunnel through the cake).

Bake at 350 degrees for 60 minutes on the center rack. Cool before removing from pan.

Dust with confectioners sugar or chocolate glaze.