The module went in last night. It was a simple install, just snapping a bypass harness into the fuel pressure sensor.
Based on what I read, the module fools the pressure sensor to think that the pressure is low, so the fuel pump raises the pressure and lowers the throttle setting. The lower throttle setting then makes the (variable vane) turbocharger open up and reduce manifold pressure, i.e. reduces pumping losses. It also makes the tranny module think the throttle is at a lower setting, causing it to upshift sooner.
I filled the tank last night, and drove it to work this morning. The truck definitely upshifts sooner, and seems to be working harder in the higher gears. For the first time, I think a "chip" is actually going to work. I'll keep you posted.
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