This. I have had one in every vehicle I have owned. I love being able to see out of both back windows at the same time. Makes my girlfriend motion sick though.

I have this one: 300mm convex

I would suggest the 270mm as the 300mm is a little too big, so it vibrates more (shaky image) over rough roads. Gonna be swapping mine for a 270mm tomorrow.

 

does this require removing your OEM mirror or does it attach over the top of it?
Does it have a nighttime dimming feature or not?
Thanks.

 

Just attaches to the front of the stock mirror. Doesn't need to be shifted for the dimming, it softens the glare automatically. I love these. Just switched out my 300mm for a blue tinted 270 and am very happy. It still shakes as much as the 300, so I guess its just the way it is.

 

Exactly how does it attach? Screws, bands..?
Thanks.

 

it is spring loaded and has 4 rubber feet. Hooks on like this:

 

I'd have to second the rear sway bar for the GE. I don't have one, but from past experiences, and an interest in handling dynamics, I'd say that it would lend itself well to enabling more driver finesse. The car rotates pretty well stock, so I can also understand why it's not as popular. This is not exactly a Fit's weak spot, but to take what is already good, and make it better; that is a good mod, and probably covers most of the underrated ones.