Towards the end of 1987 , Dauer also chose to enter the World Sports - Prototype Championship , with Johnny Dumfries and Harald Grohs co-driving in the endurance events .
Jochen Dauer was the sole driver of the machines in both championships .
Towards the end of 1987 , driver also chose to enter the World Sports - Prototype Championship , with Johnny Dumfries and Harald Grohs co-driving in the endurance events .
Jochen Dauer was the sole driver of the machines in both championships .