The 4″ Turbo Back (S6100409) is a high-quality exhaust system designed for diesel trucks. It features a single side design and is made from T409 stainless steel, making it durable and resistant to corrosion. The system also includes welded on hangers for easy installation. Its key features include improved exhaust flow, increased horsepower and torque, and a deep, aggressive sound. The benefits of this product include improved engine performance, longer lifespan, and a more appealing appearance. Its unique selling points are its high-quality materials and construction, as well as its ability to enhance the overall performance and sound of diesel trucks.