My favorites so far are the 5x7 mirrors on stock arms. So much better than the original small round ones, you can actually see what's back there when backing or checking traffic. And of course the T5 transmission. If your AD is fairly stock and a true driver, you really should check into this fairly easy and (relativity) inexpensive upgrade.
No specific images of the mirror upgrade, but the ones below gives a good idea of how they look.
