Or Forester struts?
i put outback struts on my legacy and gained about 2 inches.. so there's the answer to that.
there's some fab work to be done to put the outback (legacy outback) struts on an impreza, but it can and has been done.
Forester struts should fit an impreza just like outback struts fit my legacy being that outbacks are based on legacys and foresters are based on imprezas.
on a related note, i wonder what would happen if you put baja struts on a last model legacy, being that the baja is based on the legacy....i bet it'd work