The Peterbilt 579 Def Catalytic Exhaust Cover is a practical and beneficial addition to your vehicle. Made of stainless steel, it is durable and long-lasting. It is designed specifically for models with Dynaflex Exhaust and comes with brackets and hardware included. This cover fits most Peterbilt 579 models and is sold individually. Protect your exhaust system and improve the overall performance of your vehicle with this high-quality cover.