2011 lighting package

Few questions
1. What else did lighting package include besides HID bulbs (and smoked housing)? We're taillight LED's also part of that pack?
2. I assume non lighting pack cars have regular cruddy amber halogen headlights (amazing, on a $70k car). Pretty noticeable difference between the HID and standard non lighting pack halogens, I imagine?
3. Is it feasible (and reasonable) to buy the HID units and swap them in, or are they either $$$ or not even possible due to wiring harness differences?
Thanks!



