Your right they don't, but with the Superpro adjustable ball joints as suggested they do.
TT arms and ball joints give negative camber, but they also give an extra 10mm track which can cause problems with rubbing if you have aftermarket wheels or running low
That's why I suggested getting the Superpro, you get the weight saving of the alloy arms and the negative camber from the ball joints and save the hassle of rubbing
I've run the TT arms previously and have moved to the set up above for the reasons stated
HTH.