The 4-Inch Turbo-Back Exhaust (S6216409) is a high-quality exhaust system made from T409 stainless steel. It features a side exit design and a street profile, making it perfect for street performance vehicles. Its key features include a 4-inch diameter for maximum airflow, a turbo-back design for improved horsepower and torque, and a durable stainless steel construction for long-lasting performance. This exhaust system offers benefits such as increased engine power, improved fuel efficiency, and a deep, aggressive sound. Its unique selling points are its high-quality materials and design, which provide superior performance and durability for street performance vehicles.