An automaker may think it has engineered a car to perfection, but there is always someone, somewhere, who can improve it. A cottage industry of tuner companies has arisen around automakers, retuning engines and suspensions, swapping out parts, all in a quest to make these cars perform better.
The practice has become so popular and effective that some automakers either buy an independent tuner or build up an internal division to build performance variants of their standard-model lineups. Names such as AMG, STI, SRT, Callaway, and Shelby become synonymous with speed and squealing tires.
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