I changed out both the high and low beam to 35w HID on my 08GSA. The High beam throws a totally different pattern than the lows. It appears that the lows make a big U shaped beam ahead of you. The High beam fills this in and projects ahead. But I tell you, if you change out and go to HID, you will rarely use the High beam because the low by itself gives plenty of light. So much so most people think you have high beams on. If you ever get on some dark two lane road late at night you will be glad you went HID in both.
John Hart McComb MS
2003 Ducati 999s
2008 BMW R1200GSA Mary Jane
2005 Chaparral 210ssi " Native Sun II "