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The criteria used to design a vehicle are based in large part on the features that would sell to the widest audience at a reasonable price for the vehicle's class. Reliability, price, and fuel economy are typically factors in the decision-making process.
The aftermarket has become the means by which one may customize one's vehicle to suit a particular personality, to provide a role not satisfied by the stock vehicle, or to simply stand out. Aggressive styling and/or performance enhancements, which might not be important to the average buyer, usually make up a significant portion of the aftermarket. In fact, some parts come bundled together within a larger kit that one may choose to install in order to alter one's vehicle to a more significant degree.