12v Electric Fans?

Relentless Diesel has a nice fan write up on there site with a before and after dyno and also mpg test. Its under the dyno forums section they used the flexlite kit on a CR which is a nice kit but didn't help hp or mpg in there test.
 
I thought common rails used an electric fan clutch?
I removed my stock fan from my 1st gen and it sure is a lot quieter.
 
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