Preheat oven to 375°F.
FOR PIE: Combine sugar, corn starch, cinnamon, salt, butter and corn syrup in a large bowl. Add apples and stir to coat. Pour into pie crust.
FOR CRUMB TOPPING: Combine flour and sugar. Cut in butter with a pastry blender or two knives until mixture resembles coarse crumbs. Sprinkle evenly over pie.
Place pie on baking sheet to avoid boil-overs in oven. Bake 1 hour, until crust is brown and apples are tender.
TIPS: If crust browns too quickly, cover edges with foil halfway through baking.