6.7's are the first to be detuned a bunch, they are 300hp (chassis cab or narrow frame) vs. 400hp for wide frame (pickup box trucks). IIRC some of the 6.4 trucks were like 25 or 50 detuned.
None of the factory reflashes affected power level. A recall on an 04 was probably for elimination of using ebp, those early ones now use an inferred exhaust pressure reading. They also had a customer satisfaction thing for us to test drive, verify no driveability issues and reflash to the...
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