Have you ever removed your back seat? There's a metal bar or something that would kinda get in the way. It's been a while, so I don't remember too well. I think you could get the rear seat from a wagon or an overseas impreza, but I'm not sure.
Do the Impreza L sedans come with a folding rear seat? I can't remember...
Do the Impreza L sedans come with a folding rear seat? I can't remember...