Saleen was founded by racer Steve Saleen in 1983, the first model being produced in 1984. The first Saleens were mainly focused on handling performance and used stock Ford engines. Races Saleen has won with his Mustangs include the 24 hours races of Le Mans and Daytona, as well as many SCCA championships. Saleen Mustangs came in two main categories—the S281, which had the Ford Modular 4.6L 281CI V-8, and the S351, which had a 351ci 5.8L Windsor V-8 installed. In 1994, Saleen debuted the S351 which touted a Saleen built 351ci engine. Despite the Mustang GT changing to the modular V8 in 1996, Saleen continued with development of their own EPA-certified 351W engine. S351 was available from 1994 to 1999.