The Aeroflow Performance digital boost controller is a must have to take control of the boost level in your turbocharged car. It features three stages of boost pressure to create your own personal settings, save them and rapid switching between each setting allows you to switch between them on the fly. A scramble function also allows a burst of power to be added while driving. A lean mixture at high boost can destroy an engine in seconds, so an over boost alert is programmed into the controller to prevent turbo and engine damage. This boost controller also comes with the ability to monitor and display your engine's air/fuel ratio in either Lambda or AFR. By connecting the analogue output of most wideband O2 controllers to the auxiliary input.