Alot of Mopars look the same in 1971 across 3 badges (Chrysler-Dodge-Plymouth) (No wonder they went belly-up) I couldnt make out any emblems in the video, but going to guess it'* a Plymouth Satellite. They were rather quick and sporty looking for a family sedan. Came stock with a 318 V8. A sport model called the Sebring had the 400. It was also the body the Dodge roadrunner used.