It depends how careful you are installing the front bar. If you drop the entire subframe, then it could skew the camber/caster. If you remove the steering gear from the subframe it could make the steering wheel crocked, though total toe will stay the same. Either way it won't change much and the bar itself does not affect the alignment in any way.
Older Saturns also used the bar as a control arm, so on those cars it could have an effect.