I agree with BlueFox here. Before modifying your Foz work on your driving skills, they will make the biggest improvement.
I have only recently put a lift kit combination (heavy duty springs 1", 1" Subtle Solutions strut lift blocks and my bigger All-Terrain tyres) about 3" of lift. It makes heaps of difference especially for approach and departure angle.
I have spent thousands of dollars fixing my Foz due to damage from trying to do things it defernately doesn't specify in the owners manual for offroad use
But all the expereience makes you a better driver
My Foz will keep up with the big 4x4 for the most part, sometimes power is abit of an issue only have an EJ20 (2.0l) 5 speed manual, with 45% reduction low range. But for the most part does quite well
A sump guard that is metal is also a very very very good idea, the first thing you should do before going offroad!!!!!!! Im sure everyone on here will agree with me on that.
And as BlueFox stated diagnal spin due to open diffs is painful too. But that makes you a better driver and makes you pick the right path on a track ro route.
Here is my Foz, its a 2001.
Before liftkit with sagging stock springs. BTW my sump guard and side skirting, a Subaru diff and bog planks are on the roof basket
Ready for a camping trip
The day before my liftkit went in and the same day my clutch decided to die 600miles from home
When Clutch went, me pumping up the tyres after being towed off the beach
The trip home with liftkit and new clutch
One more for the hell of it.
And a vid for the hell of it. Just to see how capable a Foz is with stock sagging clearance but decent tyres look at my youtube channel with me at the 'Mundaring Powerlines'.
My lifted foz with me driving being the young idiot i am
Also over at OFFROADSUBARUS.com
might be more of a place for you on the net. Heaps of guys over there with some amazing machines, just like bluefox's