Drumrguy, use the Ultra Cool if that is your choice...just wanted you to know that both the Jagg and HD coolers have internal "vane/fin" structures lining the inside of the tubes that stir the oil allowing more surface area contact within the cooling tubes and ultimately to the outer fins...hence the trademark "turbulator cooling fins"...it is like adding length to a finned heatsink, so even in calm air dead stop, the oil being stirred in center at 250 deg F, still being cooled by the outside 100 deg F relatively cool air (a 150 deg F delta). One other thing, fans are unreliable mechanical devices that military grade equipment do not like to use because of poor MTBF (Mean Time Before Failure)...a quality/reliability calculation.
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