The Mack Heat Shield Cap is a practical and efficient solution for Mack GU 713 and 813 Models manufactured in 2011 and earlier. Made of durable stainless steel, this cap replaces the black OE cover that conceals the diesel particulate filter. It is sold individually and can be easily fastened using existing hardware. With its passenger side fit and plain design, the Mack Heat Shield Cap offers a reliable and functional solution to protect and enhance your vehicle's performance.