This is a real easy, inexpensive mod to do. I'm willing to bet if you can take off a wheel you can do this mod.
Theres another good bake DIY thread out there. Im putting this one together because I couldnt find all the info in one place.
Parts
-Rear h6 caliper brackets 26625ae000
-Rear 2001 Legacy Outback H6 Rotors (I picked mine up local and cheaper than having them shipped)
-Rear pads if yours are bad
-High Temp Paint if your a nerd and want everything to look good.
Tools
-14mm
-Rubber Malllet
-Pliers
-Prybar
1. Assuming you have the wheel off you are going to need the 14mm and go after the top bolts that hold on the caliper. (top finger) (bottom finger is the caliper braket bolt)
After the caliper is loose move it out of the way and proceed to the caliper brackets. Those bolts are also 14mm. Now move the caliper brackets out of the way.
2. Next the rotor has to come off. I used an assortment of hammers to work it loose and a pry bar to finish it off. Hit it with a hammer, pry, turn the rotor and repeat until it comes off. Oneside came off easy the other side, I had to work at.
3. Now with the rotor out of the way its time to bend and beat that heat sheild out of the way. I started off with pliers and bent it back than went to the rubber mallet to finish it off. I test fitted the new h6 rotor to make sure it cleared all the way around.
4. Putting it back together is easy. First the rotor. Second the new h6 caliper braket using the 14mm bolts. Transfer everything over from the old bracket, slider pins(may need grease), brake clips and pads.
^^slider pins^^
^^brake pads and clips^^
5. Now slide back on your old caliper and secure it down using the other 14mm bolts we removed earlier.
6. Your done, after you put the wheels back on and torque them down to spec. Oh and dont forget the other side.
Like I said, very simple. Maybe so simple that I just wasted my time. I did this again because I wanted all the info in one spot, with part numbers. Its probably out there, but I only found bits and peices.
If you have something to add feel free.

Theres another good bake DIY thread out there. Im putting this one together because I couldnt find all the info in one place.
Parts
-Rear h6 caliper brackets 26625ae000
-Rear 2001 Legacy Outback H6 Rotors (I picked mine up local and cheaper than having them shipped)
-Rear pads if yours are bad
-High Temp Paint if your a nerd and want everything to look good.
Tools
-14mm
-Rubber Malllet
-Pliers
-Prybar
1. Assuming you have the wheel off you are going to need the 14mm and go after the top bolts that hold on the caliper. (top finger) (bottom finger is the caliper braket bolt)

After the caliper is loose move it out of the way and proceed to the caliper brackets. Those bolts are also 14mm. Now move the caliper brackets out of the way.

2. Next the rotor has to come off. I used an assortment of hammers to work it loose and a pry bar to finish it off. Hit it with a hammer, pry, turn the rotor and repeat until it comes off. Oneside came off easy the other side, I had to work at.

3. Now with the rotor out of the way its time to bend and beat that heat sheild out of the way. I started off with pliers and bent it back than went to the rubber mallet to finish it off. I test fitted the new h6 rotor to make sure it cleared all the way around.

4. Putting it back together is easy. First the rotor. Second the new h6 caliper braket using the 14mm bolts. Transfer everything over from the old bracket, slider pins(may need grease), brake clips and pads.

^^slider pins^^

^^brake pads and clips^^
5. Now slide back on your old caliper and secure it down using the other 14mm bolts we removed earlier.

6. Your done, after you put the wheels back on and torque them down to spec. Oh and dont forget the other side.
Like I said, very simple. Maybe so simple that I just wasted my time. I did this again because I wanted all the info in one spot, with part numbers. Its probably out there, but I only found bits and peices.
If you have something to add feel free.