1.) Yes, there are options out there. H&R makes springs. Whiteline makes springs. Eibach makes springs (Prodrive too, but I think they are Eibach's). I think Tein makes a coilover, but they aren't really for competition, just for stiffer springs w/ height adjustability.

2.) No clue, but I would assume so. But then again, I don't really know.

 

nKoan pretty much filled this one out.

You might have to replace other suspension components if you wanted to use Legacy or even Outback parts. The rear suspension on the 00+ Legacy is a multi-link setup, so it's not as simple as just putting in a longer strut and adjusting camber. There are a lot of OB owners who have gone lower, but most of them are 95-99 BG models, which were struts all around.