there is a kinda big black box that sits right next to the drivers side motor mount on my friends 91 DA. i was flippin him **** about it joking and saying i heard it was like the little black box that airplanes come with to record the flight and not get messed up if the plane wrecks. but now im kinda curious... what the heck is it? any ideas would be great. no hurry either.

 

it's the cruise control unit

 

thank u very much sir.