So I may be having to do this in the next wee while, so I thought I would do some comparos.
Basically, the H6 brake upgrade is simply a large rotor - 11.4" - with a caliper mounting bracket to allow the existing single pot/piston caliper to fit over the larger rotor.
The stock dust shield is removed and NOT re-installed. It will be too small for the larger rotor. Unless you are a using the car for rallying, the dust shield is not necessary for street use.
YOU NEED TO CHECK YOUR SPECIFIC APPLICATION.
I'm doing this for a 98 GT wagon with disc brakes.
I got some prices from my fav. OEM parts dealer, http://www.subarupartsforyou.com and compared them if I was picking up replacement parts from a local Autozone store:
Now, AFAIK, that's all that's needed to install the H6 rotors (besides removing the rear dust shields). You don't even need to bleed the brakes.SUBARU H6 Brake Upgrade
SUBARU:
Description: REAR CALIPER BRACKET ONLY FOR 2000-2004 LEGACYS ALL (item 9) same part number for left or right
Part No.: 26625AE000
Fits Model: Legacy
Year(s): 2000-2004
Shipping Weight: 5
Price: $55
SUBARU:
Description: BRAKE DISC REAR ROTOR FOR 2005-2009 LEGACY GT and H6 (vented) ALL left or right same number sold individually
Part No.: 26700AE081
Fits Model: Legacy
Year(s): 2005-2009
Shipping Weight: 18
Price: $79
TOTAL SUBARU PRICE: 2x caliper brackets, 2x rear rotors = $110 + $158 = $268
AUTOZONE:
Description: REAR CALIPER BRACKET 2004 Subaru Outback AWD 3.0L SFI DOHC 6cyl
Part Number: 14-1605
Weight: 2.42 lbs
Warranty: 3 MO
Notes: Right hand side same as left
Price: $24.99
AUTOZONE:
Description: BRAKE DISC REAR ROTOR FOR 2004 Subaru Outback AWD 3.0L SFI DOHC 6cyl
DURALAST Part Number: 31273
Price: $34.99
TOTAL AUTOZONE PRICE: 2x caliper brackets, 2x rear rotors = $49.98 + $71.98 = $121.96
DIFFERENCE: $146.32
Someone correct me if I'm wrong!