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Why You Should Have Spare Car Keys Cut Many modern cars have keys that are programmable, and can be used to modify the car's settings. For instance you can alter the speed at which the car is driven or the volume of the radio. You can still customize your car even if you have an extra cut. However, you will have to reprogram the new key every time someone else drives it. Cost It is a small but a worthwhile investment to avoid the stress and cost of losing just one set of keys.