The Kenworth / Peterbilt Bellow Pipe is a practical and reliable replacement for the M66-6541-0320 OEM part. Designed to fit Kenworth and Peterbilt trucks, this bellow pipe is sold individually and offers a seamless fit. With its compatibility with OEM part numbers M66-6541-0320 and M66-6542-0320, this bellow pipe ensures optimal performance and durability. Upgrade your truck's exhaust system with this high-quality replacement, providing enhanced functionality and peace of mind on the road.