Exhaust augmentors work best at zero airspeed full power. As the
airspeed increases
the effectiveness diminishes. At some speed they do nothing. At real
high cruise speeds they could be allowing too much air to flow through
the rad overcooling it and causing more drag than necessary.

The previous statement is true, assuming that radiator has a ram air
entrance at the front of the cowl, or a side SCOOP.
Perhaps a "non ram air",  flush mounted side intake on the cowl, without any
draggy scoop would provide the simplest
of installations. Yes, the high velocity airstream on the boundary layer
side of the cowl, could cause an ever decreasing  pressure
on the the wrong side of radiator, but I doubt that, if the intake is
carefully placed on the slightly higher pressure side of the cowl.
This might reduce complexity and time necessary to install the idea.

Mike

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