A turbocharger is a device that increases the power and efficiency of an engine by compressing air and injecting it into the engine. In these specific Chevrolet Malibu models, the turbocharger part number is 12669064, but other compatible part numbers are also available, including 49180-04061, 12687043, and 12687057. This design improves the car's performance in different driving conditions, such as when accelerating or when extra power is needed. Turbocharger selection usually depends on the engine design and requirements.