The Grand Rock 8 Inch Length Pipe Reducer is a practical and versatile product that is designed to reduce a 4-inch diameter O.D to a 3 1/2-inch diameter O.D. Made with high-quality aluminized material, this pipe reducer is built to last. With a length of 8 inches, it fits most makes and models, making it a convenient choice for various applications. Whether you need to adapt your exhaust system or make modifications to your vehicle, this pipe reducer offers a reliable solution. Upgrade your equipment with this durable and efficient product.