vehicle modification

A custom car is a passenger vehicle that has been altered to improve its performance, change its aesthetics, or combine both. Some automotive enthusiasts in the United States want to push "styling and performance a step beyond the showroom floor - to truly craft an automobile of one's own." A custom car in British usage, according to Collins English Dictionary, is built to the buyer's own specifications.
Custom cars are not to be confused with coachbuilt automobiles, historically rolling chassis fitted with luxury bodywork by specialty auto body builders.

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