I was interested in putting the Charger front fascia on a Challenger, which I think would make it a little more aerodynamic. Is this doable? I'd like to avoid going the full Superbird nose cone and rear wing route, which would be costly.
You would be surprised that the Challenger is very stable at top end speeds. Watch this video where the designers discuss how they made subtle changes to the design of the Challenger based on extensive wind tunnel tests.
Right. I just think it could be a little more stable at top end speeds by changing the aero of the front fascia. I realize that I'm splitting hairs here. if you watch YouTuber's take these cars out onto the Autobahn you do see a slight differences in going 100-200 KM, and the amount of time it takes to get there.
New fenders, hood, mounting brackets, engine trim shrouds, wheel well, front spoilers. Electrical should line up. This will be a certain (more than you think) amount of work but it will be all bolt on.