^ My Euro is equipped with it. Once you push the SOS button on the ceiling it sounds a crazy alarm and notified the emergency vehicles (police, fire, medical, etc.) pretty much it acts like a 911 call. I have to pull the car off to the side cut the motor off reset the button and turn the motor back on.
I finally bought ITR 81.25mm piston just now. Got a set for $160. I just need to order the rings and bearings then I can put my LS/V back together.