I just had my nav unit replaced for flaking buttons. The idiots left the cds in the removed one, and they broke my ash tray spring. In addition the dealership, even after I said "be very careful with my car", the put a boot on the roof, and scratched the shit out of it. (what can I do about that?)......And today when I was trying to play with performance mode, I pressed the steering wheel t/c off button, and got the t/c off display on my gauge display, but then when I hit it again, the usual "you are now in perf. mode" did NOT display on my NAV unit. Anyone else experience this. Does this mean I am not in Perf Mode when I hit it the 2nd time. Or did they forget to connect something from the new Nav Unit, and it is simply not displaying it.