'07 Outback owner here. (Long time lurker, first time poster.)
Ironically, I've been thinking about switching from the OBW to a WRX. But I do love my wagon and the fact that it's paid off.
You can find some info at subaruoutback.org regarding suspension parts that you can swap in. There's not a ton of info there, but if you dig you can find it.
Another option is to call a vendor, tell them what you have and what you want to accomplish. They could probably point you in the right direction.
Anyway, enjoy your outback! I sure have enjoyed mine since '07.
And by the way, it's my favorite body style of all the Outback generations. I think the 4th gens are too tall and bulky looking.