The Peterbilt 13.39 Inch Long Stainless Steel Exhaust Bellow is a reliable and practical product designed to enhance your vehicle's exhaust system. With a 3-7/9 inch outer diameter and 3-5/6 inch inner diameter, it ensures a perfect fit. Made from durable stainless steel, this exhaust bellow is built to last. It measures 13.39 inches long, 4 inches wide, and 4 inches tall, providing optimal performance. This product is EPA 07 compliant and can be directly replaced with OE parts. It fits most Peterbilt makes and models, making it a convenient choice for any vehicle owner.