Cook pasta according to package directions; drain and transfer to a large bowl. Add 2 cups marinara sauce, half of mozzarella cheese, half of Parmesan cheese, ricotta cheese, pesto, and red pepper, stirring gently to blend.
Spoon pasta mixture into a lightly greased 13" x 9" baking dish. Spoon remaining marinara sauce over pasta; sprinkle with remaining mozzarella and Parmesan cheese.
Bake, uncovered, at 400° for 30 minutes or until cheese is melted and bubbly. Serve extra Parmesan at the table.