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Because Lexus wants you to know that it's a really, really hot brand... kinda like that Sriracha sauce. Marketing people usually aren't rocket scientists and I think they like to simplify the messages they send out.
So the Sriracha Edition is Lexus' not so subtle way of telling you that they are a really, really a hot brand, happenin you know.
Well you need that hot stuff, that's what Donna Summer once said in her music videos, so why not for the IS? Too bad she's not available to do a "hot stuff" bit for the Sriracha on a tour... well ok not so much.