(AYC) is an automobile feature designed by Mitsubishi that was introduced in the Japanese Market Mitsubishi Lancer Evolution IV and has been included in certain models of every generation up to and including the current Evolution IX.
AYC is based on a computer controlled rear differential which can actively split torque based on input from various accelerometers in the vehicle. It accomplishes this via two hydraulic clutches which can limit torque on individual axles. This system should not be confused with stability control systems which utilize the braking system of a vehicle by individually braking certain wheels to rotate and slow the car. AYC is a performance-oriented system which aims to increase cornering speeds. Starting with the Lancer Evolution VIII, AYC became the SAYC (Super-Active Yaw Control) system which utilized a planetary gearset which could support an even greater torque bias than the previous system.
Competition oriented models of the Lancer Evolution do not include the AYC/SAYC system, as it is less durable and heavier than a standard mechanical LSD. Also, in the hands of a professional race driver, the benefits of SAYC are negligible.
US-spec models of the Lancer Evolution have never included SAYC, due to a combination of cost, maintenance, and emissions issues. This has long been a point of heated debate around whether or not the US-spec model of the Lancer Evolution is a true "LanEvo". This argument seems largely moot as the Japanese market has long offered different models of the Lancer Evolution, both with and without the AYC/SAYC system.
) so don't suggest it (but if you know were there is info please tell me) Allright, i would like to know what cars can be equiped with AYC controllers.
admins and mods: please don't lock this. 
Thanks guys, I thought so but I decided to ask you because I thought you might know something I don't 
