By definition executive cars are saloons that are bigger than sports cars and family cars, yet not as big as full-sized models. However, due to the ever-increasing cost of petroleum and pollution concerns that began in the early-1980's, sales of basic executive cars began to decline. Thus, in order to curb this financial loss manufacturers began developing different executive car models with varying high-tech options in order to curb financial losses.

In the United Kingdom executive cars were given two different types of body styles: saloons and sports models. When designing saloons, manufacturers began offering many different styles that included four- door liftbacks and five-door hatchback. In 1976 Rover released its first version of the modified executive car with its SD1 model. Originally Rover released the SD1 as a four-door liftback with a 2.2 liter four cylinder engine; however, the following years saw the company change the motors to 2.3 and 2.6 liters. This design was immensely popular and the Rover SD1 even received award of European Car of the year in 1977. In 1980 the model underwent a few changes which consisted of giving consumers the option of purchasing an eight cylinder engine. Also the SD1 models were overhauled b making improvements to the interior and exterior design; however, the success of the improvements was short-lived as the company soon stopped producing the model in 1986 due to a decline in sales.

An executive car that was modified to become a compact executive car, or sports car, in the United Kingdom was the Triumph Dolomite. Production of this line began in 1972 when the British Leyland organization introduced the car as the next generation of the Triumph Vitesse line. The modifications that it showcased was a manual transmission, a state-of-the-art clock, rear heated windows, and luxury seats. The performance of the car's 95 horsepower slant-four 1850 cm3 engine was quite remarkable for its time, as the Dolomite was able to reach speeds of an excess of 120 kilometers per hour. Even more impressive was the quick acceleration of the car which would reach nearly 80 kilometers per hour in only 11 seconds.

Another original modified executive car that was popular in the United Kingdom when they were first released was the BMW 3 Series. Production of this line began in 1975 with the BMW E21. These modified executive cars were an instant hit and became synonymous with the "yuppie" social caste. The early modifications that they employed were turbo charged four cylinder engines (the 316 - 1.6 liter; the 318 - 1,8 liter; and the 320 - 2.0 liter) and a small body and wheel base design.