Sorry Bortaf all I can see for 5831 is a Renault 18 Turbo!
JP...The works Cologne RS's were Gp2, semi-works & privateer Mk2's also ran to Gp2 mostly at Spa, like this one....
Rather than converting your car to Gp2, maybe it would be best to see what championships there are runnung in your country and modifying the car to one of these, incase there is nothing for Gp2.
I like the Liqui Moly Zakspeed colour scheme, great looking Capri you've got there.
Ah Spa amazing place, I raced there back in '97, here's a pic of me going through Blanchimont at 150mph on the way down to the Bus Stop Chicane....
Also raced at your local Zandvoort back in '89 before they had to shorten it because a new housing estate was built right next to the track!!!!