I worked on the wife challenger - polished intake, RIPP coil packs, high end plugs, throttle body swap, bolt on exhaust, and tune.. with hellcat box and K&N - all that motor work netted me 16hp at the tuner.... No real difference in performance and reduced gas mileage as I enjoyed the sound...
I swapped out the scat pack seats from a wide body to v6 challenger - had hell on the side airbag and never was able to get the airbag light to come off. Something about disconnecting all power before unplugging them - anyway, just fyi if you make the attempt, discharge all electricity and...