The Kenworth / Peterbilt Bellow Pipe is a practical and reliable replacement for the OEM part numbers M66-6541-0405 and M66-7091-0405. Sold individually, this bellow pipe offers a cost-effective solution for maintaining the performance of your Kenworth or Peterbilt vehicle. With its durable construction and precise fit, it ensures optimal functionality and longevity. Upgrade your exhaust system with this high-quality bellow pipe, designed to deliver exceptional performance and efficiency.