It is a fairly complicated process thanks to all of the guys who brought in R32-R34 Skylines without doing the paperwork properly. If you own the vehicle AND the vehicle already meets (or can be made to meet) US Safety Standards and pass US Emissions testing, then you can bring it back through US Government Transportation. The trick is having a Registered Importer to sign off or actually perform the modification that brings the car into US Safety and Emission standards. There is also a time limit associated. The paperwork is straight forward, but MANY people chop it up. Do a little research and you will find everything you need. I got most of what I needed from the NHTSA website.
That is the shortest answer that I can provide.......lol
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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