Stacking (running two electronic power adders) on the 6.0 has been shown to be the quickest recipie for stretched head bolts and blown head gaskets..My opinion is your asking for trouble in a relatively short time frame....
SCT gets my vote..The only advantage the banks product has is switch on the fly which for me is not important...A custom SCT race file will out run the six gun...and you can have your egr turned off. and you can have custome files for injectors, turbo's and other aftermarket products.. I do not know if the six gun has any Transmission control other then defueling...the SCT does..
closing the egr reduces your egt's by about 100 or so degrees..and your no longer pumping soot back through your intake manifold and engine....The Sct increases line preasures and clutch applications and stuff to help it handle the added power..and you can have the shift points/firmness set to your liking...
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