RE: Charger news and 6.4L engine for Challenger
I'm guessing the "legality" of the engine refers to emissions and mileage testing / compliance.
I'm sure the crate motor would also have to be retuned /fine-tuned for use in the street / production version of the Challenger.
Not to start rhumors, but I "heard/read" that work was being done on either the 6.1L or 6.4L to get it to run the MDS that is currently on the 5.7L Hemi. IF this is true, I'm sure they'd want to have it done before putting it into a production car.