FAST-FLASH computer programmers were developed to permit tuning for specific needs. They offer a variety of tuning options and are easy to use. Just plug one of the FAST-FLASH computer programmers into your vehicle's OBDII port located under the dash, and it will communicate with your vehicle's computer. A simple series of yes or no questions allows you to tune your engine for better performance. With the ability to change shift points, make corrections for gear ratio or tire height changes, and correct the speedometer, these FAST-FLASH computer programmers are sure to get the job done.