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In all the years I have owned a 3rd Gen GS460 and a 4th Gen GS350. No one has ever thought My GS was a IS! But..... if you put IS designed things on your GS.
So, I was referring to those who are "not in the know". I own a 2015 GS350 F Sport and many times people have asked me what year my "IS" is. Those who are not familiar with Lexus cars will mistake the GS with the IS.