Also, in the how-to it mentions moving the wheels forward in the wheelbase, reading the instructions through a few times I'm not understanding how this moves the wheels forward. It reads to me as though it is just widened... What am I missing?
As you move the rear control arm bolts outwards, it widens the stance but since you are not moving the front arm bolt, it sort of "rotates" the control arm outwards, which moves the lower balljoint mount forward. I haven't done this mod but it makes sense how it works, kinds of helps to draw it out it makes better sense if you think of how it would "pivot" around that front bolt.
FRONT
L bolt R bolt
o o stays put
_/ \_
o__ <-----L balljoint R-----> __o each balljoint moves outwards and thus forwards because front bolt stays
<---- o rear bolts o ----> rear bolts are relocated outwards