The 4eat and 5eat models with VTD are like that. They have a planetary center diff with electric clutches that can then move power f/r. The 07/08 forester XT sports have this as well as most of the other H6 models. The MPT isn't the greatest from a performance standpoint, but it does a good job for a daily driver. It would be great if subaru would put a lsd in the front diff on 4eat models though.I'll be honest. I don't like the 4EAT AWD system. There has to be a better set-up. Is there any reason the 4EAT can't also get a viscous center diff? Why not use a front and rear Torsen diffs and a rear-bias planetary center diff. Throw some VDC in there and you'd have a superior AWD system, no?