6. Ford Mustang McLaren M81
Ford built this exciting car with the help of the well-known McLaren racing team. The whole idea behind the project was to take the 2.3-liter turbo engine from the regular Mustang and transform it into a street racing beast. They added a race-tuned suspension, a lightweight body, and a host of other modifications. McLaren and Ford installed a tuned turbo engine with 190 HP. That was a big number for the day, especially coming from 2.3 liters (via The Drive).
They changed the looks of the Fox Mustang, as well. The updates resulted in a performance level that was good for the standards of the day but is quite embarrassing today. The driving dynamics were excellent, but the car came with a high price tag, making it a sales failure as a result.