Grand Touring Supreme

naturally-aspirated. Between 1995 and 1996 in the IMSA GT Championship, the top GTS class became known as GTS-1, while the former Grand Touring Under (GTU) class became known as GTS-2. This changed again in 1997, when the GTS-2 (former GTU) class became known as GTS-3, due to the addition of a new GTS-2 category, which allowed for existing international GT2 cars, like those used in the FIA GT Championship.^[1] IMSA also used the GTS designation for the former GT2 class cars of cars (later known as GT1) in the American Le Mans Series