...annnnnnd round two!
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Here with the Flexalite which I ripped out in Moab on the side of the road you can see the shroud comes nowhere close to containing the airflow through the whole radiator.
The new SPAL set up will be modified into the OE shroud. This will also have a programable ECU for the fan which will be tied into the OE temp sensor, and not just a cheesy through core stat. By going this rout the fan comes on at 50% when the ECU reaches the low set target temp, and as the temp goes up the fan speed increases.
Anyway, after the install is complete and I have some miles on it I will share the results.