The Peterbilt 388 And 389 2007 And Newer Exhaust Shroud Extension is a practical and beneficial product made of stainless steel. It is designed specifically for the rear exhaust and fits most Peterbilt 388 and 389 2007 and newer makes and models. This extension is not suitable for use on 389 models with 36-inch sleepers. Sold in pairs, it is a reliable and durable solution for enhancing the performance and appearance of your Peterbilt truck.