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He's talking about the small 4 LED on the side of the tails, which the JDM doesn't have.
EDIT: wait I'm confused.
yeah.. i am also confused by which he is talking.. the Taillights that we have.. is actually LED and... the 4 LED is USDM which he mentioned in the title..
i've got the ebay LED tails... it's awesomeeeee.. should get it