See the attached images. The color of the wires are the same in the '08 and the '05. The only difference is the module the wires are connected is flipped 180 degrees. The '05 photo shows the black connector on the driver side, the '08 shows the same connector on the passenger side. To gain access to the black connector I had to remove additional panels, which is no big deal. Locate the red wire with the green stripe and cut it in half. Then connect one end of the red-green wire to the lime colored wire. If you have an Outback like I do you may want to have the hatch unlock along with the doors. To do that locate the white-black wire next to the lime wire. Cut the white-black wire and connect one end to the lime wire.
See this post if you have an Outback: http://legacygt.com/forums/showthread.php?p=304632#post304632
Prior to the mod, the alarm light in my car never flashes with the ignition off and the alarm OFF. After the mod the light flashes when the ignition is off and the alarm is OFF. The alarm still works fine with this mod.