The Peterbilt 13.98 Inch Long Stainless Steel Exhaust Bellow is a durable and reliable replacement part for your vehicle's exhaust system. With a 2-1/3 inch outer diameter and a 2-3/8 inch inner diameter, this bellow is designed to fit most Peterbilt makes and models, making it a practical and cost-effective choice. Constructed from stainless steel, it meets EPA 07 emission norms, ensuring minimal environmental impact. Sold individually, this bellow is directly replaceable with OE parts, providing a hassle-free installation process. With direct OE replacement numbers KW-6559 and M66-6559, this exhaust bellow offers a seamless fit and optimal performance.