The Morimoto's I currently have draw 8 amps at startup - that's too much for the GS's ECU/ZFE. The newer / later ones are drawing considerably less than that at start up (I'm talking about 'all' canbus ballasts in general) and should have a better or acceptable match.
The newer Morimoto's only draw 6 amps on start up. These cost more than the 'overseas' options. I called "The Retrofit Source" and they couldn't give a money back guarantee because they weren't designed specifically for the GS. So I don't know if they will work without any issues, or without a relay.
I also did a quick check on some of the 'overseas' companies that offer cheaper sets. A LOT of them did have a 10 amp draw at start up - so beware of that. I'll say I just mis-spoke before I did some hard research.
My bad. There are some that have 6 amps and lower on start up, you'll just have to be cautious.