On the HTC, when mixing Group 1, Group 1+, Group 2 and Group A, all depending of the era and relevant Appendix J or Period we should say here more or less, they are very complicated categories.
To normal people they look production and it is only true to the Group 1 cars, then they are pretty much prototypes and all models, depending on the period tuner were different.
A simple example was that in period, there were the Cologne and Broadspeed Fords, the Alpina, Schnitzer and Motorsport cars, base was the same but details weren't.
And as in period, when you talk touring cars, you need heavy scrutineering if you want to keep it correct as well as in depth knowledge but yeah, who cares anymore.
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