thats same as mine. what do the vents on the roof do? do they exhaust air from the passenger compartment or the engine bay. when my car did the exxon valdez and spilled LHM on the header which smoke came out of those vents as well as the vents at the rear of the decklid and the shark gills.
IMHO not very much. Not nearly enough at speed. There was an early Bora that had fabricated intake scoups attached to the, I've had no reports on their effectiveness or whether there were also modifications to route the air internally towhere??? Remember, the engine cover assembly is essentially trying to get airflow that enters the compartment from below to exit out those rear most quarter vents. It doesn't work very well and so the heat builds up, no fresh cool air enters this assembly and the entire rear structure (engine, sub-frame, hatch and body frame becomes a gigantic heat-sink. In my experience running WO the cover made no difference and allowed road debris to deposit over the entire assembly.
