The Grand Rock 304 Stainless Steel Heat Diverter Box is a practical and reliable solution for redirecting heat in your vehicle. Made from durable 304 stainless steel, this heat diverter box features 4-inch I.D holes that efficiently distribute heat. It is designed to fit most makes and models, making it a versatile choice. Please note that these parts are not approved for use on 2007 and later emission engines. Sold individually, this heat diverter box is a must-have for anyone looking to enhance their vehicle's performance and functionality.