Upgrade your International LoneStar or ProStar 2011-2014 with the Flex Bellows Kit. This kit includes a 4-inch inside diameter, 14.5-inch length exhaust bellow, 2 clamps, and 2 gaskets, providing a complete installation. Engineered in North America with durable materials, this exhaust flex pipe prevents leaks, ensuring engine efficiency. Quality tested for proper fit and performance, this trustworthy construction offers reliability and a long service life. Direct OE replacement numbers Navistar: 2512967C1, 3854061C1, and 3859149C1. Trust this flex bellows kit for a seamless fit and function, enhancing your vehicle's performance.