Preheat oven to 350.
Grease 11x13" pan.
In a large bowl, combine cake mix, pumpkin, oil, eggs and pumpkin pie spice.
Mix until combined.
Pour into prepared pan and bake for 25-30 minutes or until toothpick inserted in center comes out clean.
Allow to cool until slightly warm.
With the end of a large wooden spoon, poke holes throughout cake.
Heat caramel in microwave for 1 minute.
Fill each hole 3/4 full of caramel. Reserve about 2 ounces of caramel for topping.
In a medium bowl, beat cream cheese until smooth.
Add in powdered sugar and beat until blended.
Fold whipped topping into mixture.
Spread topping over cake, making sure to push into holes.
Drizzle with remaining caramel and top with chopped pecans if desired.