Gruppe-S Engineering is the retail subsidiary of Dynamic Autosports Inc, a market leader in the automotive performance aftermarket.  Through hard-work, a philosophy of low prices, and excellent customer service, Gruppe-S / DA has maintained its position as an industry leader for the last 16 years.  Now operating from our 35,000 sq.ft. headquarters in Lake Forest, California, we have over $1 million USD in inventory, 17 full-time employees, 4 full service lifts, and a Mustang-dyne AWD Dynamometer.   We are the one-stop shop for all your automotive performance needs.