Installed the HIR 9012 low beam bulbs yesterday and while it's not the jump from stock to HID, it's certainly better than ANY halogen bulb out there. Definitely better than stock and a helluva lot cheaper than PIAA's. The guy that sells them (Bill Fox), really knows his stuff. The bulbs can be found at www.finemotoring.com. You have to trim the top tab to make them fit in a 9006 mounting but for the '06 Civic, I had to shave the barrel (the part right underneath the glass but above the O-ring) because the hole in a Civic housing has a ridge in it and the barrel on a 9012 HIR is oh-so-slightly bigger than a 9006. They would probably fit in a G2 just fine.
My advice would be to try them out. I may end up trying the 9011 HIR (high beams) and modifying them to fit in the lows by shaving the tab on the inside of the plug, just like a 9005 to 9006 conversion. Looks like that if you trim the top tab (he marks them for cutting for you) and take the O-ring off of the old bulbs and slide them down to the base of the barrel up against the flange, they fit beautifully in a 9006 mounting. IMO, at $29.95/ea., it's hard to go wrong.
My advice would be to try them out. I may end up trying the 9011 HIR (high beams) and modifying them to fit in the lows by shaving the tab on the inside of the plug, just like a 9005 to 9006 conversion. Looks like that if you trim the top tab (he marks them for cutting for you) and take the O-ring off of the old bulbs and slide them down to the base of the barrel up against the flange, they fit beautifully in a 9006 mounting. IMO, at $29.95/ea., it's hard to go wrong.