[grober]

Does this not mean your underbonnet air temperature will rise---not the engine you understand since its got a direct coupled means of cooling via the "part rad"--- but the air space and with it all those sensitive little sensors/ECU'S which don't like it hot??? Surely a better solution would be to arrange additional "exits" via louvres under the wings or on the bonnet assuming they didn't screw with the aerodynamics??