Preheat oven to 350'. Spray a 13x9 pan with Pam. Set aside. Cook pasta do not add salt. Drain. To prepare filling, cook sauage over med heat till no longer pink, about 5 minutes. Drain on paper towels. In large bowl, combine ricotta, sausage, half cup mozzarella, Parmesan, egg, parsley, and pepper. Mix well. Spoon filling evenly into cooked manicotti. Place stuffed manicotti in a single layer in prepared pan. Spoon tomato sauce evenly over manicotti. Sprinkle with remaining mozzarella. Bake until heated through and cheese melts, about 35 minutes. Serve immediately.