This article is from the Motorsport FAQ, by A H Henry email@example.com with numerous contributions by others.
These are used for the DTM.
Engines must be 2.5 litres with no turbo and a maximum of six
cylinders. There is no engine rev limit.
In the DTM, minimum weights are set by the governing body, the ONS.
Alfa 155 4wd 420hp min.weight: 1040 kilo no active suspension, no
traction control (but it's due by mid season). Mercedes C180 450hp(?)
min.weight 1000 kilo ABC (active body control) Opel Calibra 4wd,
425hp min.weight: 1040 kilo no active suspension, no traction control