Why are NASCAR's designed to be the shape they are?

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NASCAR cars are supposed to be the same body shape as a models from a manufacturer's range of cars (or pickup trucks) in a similar way to rally cars. These can be modified in certain ways, such as wider tyres and a vertical spoiler on the back of the boot designed with aerodynamics, downforce and streamlining in mind. © Cranfield University

NASCAR cars are supposed to be the same body shape as a models from a manufacturer's range of cars (or pickup trucks) in a similar way to rally cars.

These can be modified in certain ways, such as wider tyres and a vertical spoiler on the back of the boot designed with aerodynamics, downforce and streamlining in mind.