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If you improve your fuel consumption by 12% you'll have a lot of people jumping on the bandwagon. Please please please, get mpg numbers from a large sample size before and after.... I've seen 7-12mpg from stock 939A2s with the 8.3.

Incorrect wiring is one failure modality. Here's another - http://www.cumminsforum.com/forum/07-5-09-3rd-gen-6-7l-performance-parts-discussion/1617938-snow-performance-bent-rod.html?nocache=1455146625375. First hand experience, not me. Not my monkey, not my circus. I have no stake in this...

And when it fails, it fails "on" and trickles water and fills up the rear cylinder. Then when you go to start it it destroys your engine. I've seen this more than once. Not worth the risk IMO.