Preheat oven to 350°F. If using a roll out pie crust, unroll it and place it in a pie dish. In a large bowl, mix together the eggs, sugar, vanilla, cinnamon, salt, pumpkin, corn syrup and butter. Pour mixture into pie crust. Top with chopped pecans. Bake for 45-50 minutes or until filling does not jiggle. Once cooled, serve topped with whipped cream.