I can understand your confusion, I'll take a stab at this as it's been a while since I looked into it and wanted to know as well.
Last I heard, you have to modify your turn signal flasher relay in order to keep it from "hyperflashing" when using LED, or they now have led bulbs with the resistors already built in.
An example of the leds lights with the resistors built in:
Here is an explanation of modifying the stock flasher with a resistor:
I don't believe they make an LED flasher relay that's plug and play for the GX (but I know they do for other models)
Maybe something has come along since then for the GX, in which case, I'd appreciate any users giving a link.