 Other well known participants were the Tiga, Royale, Alba, Fabcar, and Kudzu.Starting with the 1986 season, the GTP category had their own decal, which was similar to the IMSA GT side decal, with a "P" being added to denote their category.Camel Lights cars also used the same decal

There were many other manufacturers in the GTP class, such as URD Rennsport, Spice, Intrepid or Gebhardt, and in the early 1990s, Mazda.