No, the S designation was for the two G15 that were built by the factory with ultra light weight bodies and chassis specifically for racing. All others from beginning of production to end were “G15” with the exception of the two G15 Super S VW beetle engined cars made for Art Allen to meet California emissions. All mine are “G15” with 875, 998, 1040, and 1228cc engines. Both standard and wide body.