I've only seen one real EK9 here in the states but there are a lot more obviously. The one I saw was just a coupla weeks ago at Import Alliance 2007 Fall. It was turbo'd and had seen it's share of races cause it was rough lookin and the interior was kinda nasty. It was most certainly a car that had been used a lot. Not only was it there but a real EG6 SiR and EF SiR were there with it (and an R32 Skyline, R33 Skyline, 2 S15 Sylvias, and maybe an R34. There was plenty of JDM cars there).
I believe in Tennessee, getting a JDM or any other RHD vehicle legal is a lot easier. Also, cops don't give a crap about what's on it. People out here have JDM lighting on their cars everywhere and none get in trouble. I have EK9 styled headlights and replica JDM square yellow fogs and nothing yet. See at the IA 07 Fall meet, there were a ton of JDM RHD vehicles. All were street legal and most were from Tennessee (the Fall meet is smaller and more local than the Summer meet). I think all you have to do is prove they meet safety standards (in the case of Civics, you just show them that it's the same thing with the steering wheel on the other side). I'll have to ask my mom on the details (she's a deputy county clerk and she registers and titles vehicles).