Like is it a better engine, is it faster, just what is the difference?

Only a couple small differences. The 07 had a slightly different turbo that fixes the boost creep issues the previous models had. It flows the same amount & is actually exactly the same size but has a little different waste gate opening. The other difference is in one of the gears. Some of the people who drag race their cars like the 07 gearing better because u do not have to shift into 5th gear in the 1/4 mile but other wise it is not that noticeable. Otherwise the two cars r identical everywhere so a good deal on an 06 is definitely worth it.

to add, the lower part of the 06 tailights were darker/greyer, while the 07 is had a chrome lower taillight.