Back in the days I had the chance to try one out, the 2.3 Cosworth but unfortunately with the auto gearbox which was quite sluggish.
Nonetheless a very very enjoyable car.
The local meat 'baron' had a manual 2.3-16 (and a 928S as well) and it was driven very hard, one of the few I couldn't keep up with with my 90 hp Jetta

.
Those were the days !!!!
Old Bim