There are  2 or 3 subgroups (GT3, GT4, and GT Open) in cars with Grand Touring label, but Touring Cars, which are designed for racing competition and motorsports are categorized base on their calculated engine capacity (TC1 - TC4).
There are  2 or 3 subgroups (GT3, GT4, and GT Open) in cars with Grand Touring label, but Touring Cars, which are designed for racing competition and motorsports are categorized base on their calculated engine capacity (TC1 - TC4).