To do a lift and bigger tire's is not that simple on this car . First the transaxle , cv shafts would need to be longer and working angel would have to be wider . Yes a spacer can be put in but changes driver angel . Rear could be done with spacers like you would do with a front axle on say a Chevy pickup . To run bigger tire's you need to regear front and rear final driver gear , that may not be available or the car will be a dog at low rpm and hard on clutches or run an automatic really hot . This car does not have a t case so no gearing down . I've been off-roading for 30 plus years and built so crazy stuff !My avatar is my 67 Bronco and everything is custom on it , 4 link front and rear 26 inches of travel on the front axle 34 inches on the rear , full hydraulic steering . To do what you want is very pricey with very little gain ! Stick to the rally car world ! This wil not be and off-roader !
That's pretty much the same info I've been coming across online. Anybody that's gone over 4 inches of lift, has done so with different axles/transmission. The Subaru boxer motor works pretty well in off-road applications, if it can be mated with appropriate gearing/shifting. There are also dual-range transmissions on some Euro/Aus models of Subaru, there's a possibility of a swap (Some old Subaru models also had dual-range 4x4, instead of the modern AWD). But the CV angle still gets to be a problem with much lift. The biggest Subaru I found last night ended up swapping for a Toyota transmission and different axles. Working within these limitations sounds like a good challenge for one of these shows though. Everybody knows how to make an off-roader out of pickups. But yeah, I understand what you're saying - those limitations are pretty solid and you have to gut much of what is actually Subaru to make it compete with trucks. It doesn't necessarily need to compete with trucks though, just provide better off-road performance over stock.
I think part of the issue is that these vehicles are so damn capable from the factory, that we want to see what can really be done with them. However, Subaru didn't leave much room to grow. You can beef up the motor and give it some height, but you might not like doing what needs done in order to go farther.
I'd still watch a Subaru build though. They could do a Forester; swap in the dual range, beef up the CVs, etc. Just to see what the best is that they could do.