The 3.5 Inch ID 18 Inch Long Aluminized Curved Top Stack is a practical and versatile product that fits most makes and models. Made from durable aluminized steel, this curved style stack is 18 inches long and has a 3.5 inch inner diameter. It is sold individually and offers a reliable solution for enhancing exhaust systems. With its high-quality construction and universal fit, this stack provides improved performance and durability, making it an excellent choice for any vehicle.