What is the difference between 3157 and 3157KX bulbs?

The primary difference between 3157 and 3157KX bulbs lies in their brightness and application. The 3157KX is typically a higher-output version of the standard 3157 bulb, designed to provide increased light output and enhanced visibility. Both bulbs have the same base and fitment, but the 3157KX is often used in situations where brighter lighting is needed, such as in brake lights or turn signals. Always check compatibility with your vehicle before replacing bulbs.