The Grand Rock 2 Position Diverter Box is a practical and versatile product designed to enhance your vehicle's performance. With 4-inch I.D holes and a 6-inch by 6-inch box, this 2-position heat diverter box is perfect for most makes and models prior to 2007. It features easy installation and is not approved for use on 2007 and later emission engines. This diverter box is sold individually and offers improved functionality for your vehicle. Upgrade your vehicle's performance with the Grand Rock 2 Position Diverter Box.