The XR3F-12A650-VD Engine Computer (ECM) for the 1999-2000 Ford Mustang GT 4.6L is a programming required unit with a maximum amperage of 12A. This ECU is designed by Ford with optimal durability features, featuring pin terminals and a compact size of 10 inches in length, 8 inches in width, and 0.5 inches in height. It comes with a manufacturer warranty and is specifically made for the front placement on the vehicle. The ECM is an essential part for controlling the engine performance of the mentioned vehicle model.