9: 1965 Ford Mustang 289 HiPo
Ford did a lot of experimentation with the Mustang during this period, and the 289 HiPo was no different. The overall look of the HiPo was the same but the appeal was the added performance of the car. Unfortunately, Ford rushed into the design of the car and a lot of people were off-put by this. Thus the general Mustang models far outsold this one for several reasons.
The 271 HP was sufficient but it was nothing to get excited about, and thus a lot of consumers just went for the GT. The resale value of these Mustang models is not as good as you’d think, especially when you compare it to other models. Mustang fans just generally avoid this model altogether.