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I have no experience with this but my guess is no. I am on the GX forum pretty regularly and the conversion from the 10-13 headlights w/out Led’s Is more complicated than just the fit. The daylight running lights connectors are not plug and play with the LED running lights on the 14+ models on the GX’s and I imagine it is similar for the IS.
Yes they do, but they need to be repinned and possibly programmed from what i hear. Look on the IS sedans forums, I know many 08 ISFs running with 11+ headlights.