I think the red exhaust line is correct for cornering speeds. And at speeds greater than the fastest cornering speeds, the exhaust gets blown more straight aft (more along the green line. This is most likely the reason for the naca duct too), reducing the sealing effect, and therefore downforce and drag. You could think of the "bridge" piece of sidepod between these two lines as a speed sensitive/controlled "splitter" for the exhaust flow. The black, heat-resistant portion of the sidepod is probably changeable, in order to tune the splitter to the speed of the fastest corner on each particular circuit.
