Ok, so after installing alphawerks headers, GReddy Evo II, UT Z tube and Stillen Sways, my car is saying I have a VDC problem. Does anyone know why this would be? I've tried resetting my ECU with no help, it came right back. No CES, just VDC off and Slip... any ideas?

What exactly does VDC sense? because if I know what the system is tied into, I can go from there...