Just to update this instead of posting a new thread: I installed Bilstein 5100's on my 4Runner yesterday. I put the stock springs on the 0.85" perch up front.
I ABSOLUTELY LOVE THE WAY IT DRIVES NOW!!!
The front right was a little moist on the top, and the front left might have been leaking on the hose connection a little. The rears extended fine, but the damping seemed really stiff on compression with a hand test.
The 5100's lifted it up all the way around, and the extra wheel travel in front is great compared to worn out XREAS. I was frequently running into the bump stops with almost no damping up front and a low ride height. I didn't take detailed measurements before I started, but I'd say the fronts lifted up probably 2-2.5" or so, and the rear about 1.5". But I just can't get over how much better the truck rides. It's amazing, and feels very well controlled everywhere. Handling has improved as well, just because there's proper damping on all 4 corners that feels balanced.
BTW - I have 81k miles on mine, so I think the XREAS was pretty dead a while ago given how much better then 5100's feel.
For anybody doing the install, just go ahead and pull the skidplate and front sway bar. I fought for about 45 mins trying to get the stock shock out with the sway in place, and it was not happening. I also suggest removing the lower ball joint bolts and just dropping that to make installing the 5100's easier, as they're almost an inch longer. Other than those two issues, the install was pretty easy. I did have to trim one rubber spacer on the rear, as the 5100 stuff is so long you can just barely thread a nut on the stud with them at stock thickness. They really needed to be just 1/16-1/8" shorter to be able to start the nut without all the planets aligned (I got it on one side, gave up on the other and trimmed 1/8" off the rubber).