[2] The basic unit had to be derived from a production engine made in quantity by the same manufacturer as the car, although it did not have to be from the same model as that being raced and could be extensively modified.
[2] Aerodynamic aids were free below the wheel centreline and, from 1995, suspension systems could be purpose-built rather than production-based.
[10] Later in the same year however, the regulation changes were postponed to 2019 given DTM manufacturers' reluctance to potentially engage in more costly development.
[12] The second generation of Class 1 Touring Car is a purpose-built racer based on a two-door road-going model.
[15] Aston Martin, entering DTM for the first time through the new regulations, concluded their program after a single season with constructors R-Motorsport claiming the cars were too expensive.