I have an 08' Legacy 3.0R and all I did was pull the white plug...
http://i70.photobucket.com/albums/i97/swivel_dick/215be628.jpg
This DRL "box" is as far to the drivers side of the car you can pretty much get...
http://i70.photobucket.com/albums/i97/swivel_dick/6116aebe.jpg
http://i70.photobucket.com/albums/i97/swivel_dick/5a0ad15e.jpg
I didn't bother cutting/pulling any wires... this fully disabled my DRL's and EVERYHTING else works as normal - I tested everything!
My 2001 Subaru Legacy GT, and my wife's 2005 Subaru Outback 3.0R VDC was the same EXACT thing as well
*EDIT* I was wrong, high-beam indicator light does not work in dash. Maybe I will have to cut that blasted wire after all!