1. Fit piecrust into a 9-inch pie plate according to package directions. Fold edges under, and crimp.
2. Beat cream cheese, 1 egg, 1/2 cup sugar, 1 tsp. vanilla, and salt at medium speed with an electric mixer until smooth. Pour cream cheese mixture into piecrust; sprinkle evenly with chopped pecans.
3. Whisk together corn syrup and remaining 3 eggs, 1/4 cup sugar, and 1 tsp. vanilla; pour mixture over pecans. Place pie on a baking sheet.
4. Bake at 350° on lowest oven rack 50 to 55 minutes or until pie is set. Cool on a wire rack 1 hour or until completely cool. Serve immediately, or cover and chill up to 2 days.