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The 3126b and the C7 are almost the same engine. They use essentially the same turbocharger (same size, etc) for both the 275 HP and 330 HP variants. Indeed even the 370 HP C7 used in the M-ATV is the same size - it just has a water cooled CHRA to prevent engine oil coking under extreme...

With computerized fuel injection the ECM is the gatekeeper to all potential upgrades. It regulates boost pressure and supplies the correct amount of fuel to go along with the additional air being delivered - and since these engines have no closed loop fuel control the engine computer has ZERO...