2003 Hemi into 2004 Body
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Yes it will drop right in, HOWEVER...your 04 is setup for EGR and the 03 head and intake will not have the ports (or tube) for it. Can either custom tune to get rid of it or you'll have to punch the front of the head for it. Everything else should be plug and play, if you have any doubt with specific plugs or sensors not matching, use the original ones from the 04 so they match up with your harness.