Difference between models and years?
I've read a few things about grey center caps on the GXp but that's about it and I don't really get that.
Only one year of Supers.
Unsure about the SSes.

I have seen some differences in the Impalas
I have an 06 with an auto-dimming rear view mirror, and a 6 Disc in-dash cd changer. My buddy has an 07 that has neither.
Some were made w/o sunroofs. And '09 and later they put this awful looking lip on the side of the car, looks like the GP's.
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Does anyone have a side-by-side shot of the two different GXP rims? I'd like to see that.
06's said "displacement on demand" on engine cover while '07's said "active fuel management", the 07's had some color changes, and the '06's had 100 more horsepower!
(one of the previous items listed may have been embellished by 100 horsepower, FYI.
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