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From a 1988 DTM preview I have figures for the Opel Kadett GSi 16V telling of 267 bhp to 814 kgs. For the German series the Kadetts were allowed to breathe a little easier and running less weight than their Group A cousins - I have heard similar 220-230 bhp, although the oppositions thought is was more than that, and a minimum FIA Group A weight of 860 kgs for 2.0 litre cars. I wouldn't be surprised if the DTM cars ran wider rims as well, but haven't found any figures for either the DTM or BTCC cars.
Jesper
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