ExCel XL-1016-M Mega Install Kit, (GM 7.5 10 Bolt 7) Warranted against defects for a period of two(2) year under normal driving conditions The highest standards of manufacturing are applied in the production of products. From machining and finishing to heat treatment we demand the best Engineered to perform faster and more reliable, our products are winners both at the Daytona 500 and U.S. Nationals for decades