I have read a couple threads about the 04 HEMI mentioning the "learning" ECM and stating that this new ECM in the new trucks modifies performance (even after mods) back to factory tolerances.
This sounds believable. However, it also sounds a little fishy.
Does anyone have any solid proof (dyno, 0-60 times, quarter mile times, etc.)of this, or is it all heresay?