I know that its hard to get the skyline into the states, but what
about the altiezza, fairlady Z, or the silvia? Are they just as hard
or easier because they make almost the same cars in the states? To
refer back to what was said about bringing the skyline into the states
in peices and reasembling it back in the states, when I talked to some
shipping companies they said there are some headlights and bumpers
that you can not bring into the states. So would the skyline
headlights and bumpers fall under that catagory?

Dear  lzanki

This might help: 
Vehicle Importation Regulations 
<http://www.nhtsa.dot.gov/cars/rules/import/> 

However, if you need more research besides that, your question will
require more time and effort than the average amount of time and
effort associated with this price. Here is a link to guidelines about
pricing your question, in the pricing guide:
https://answers.google.com/answers/pricing.html

Usually, the cost is not worth the idea. The most expensive part is
getting it DOT certified. This means emissions, safety, etc. The cost
of this alone can run up to $10,000. This is assuming you can even get
the car into the states. Plus, you have to ask yourself if your
company will even insure it. If they won't, who will and at what cost?
Imagine wrecking it and trying to import a axle from Japan!

There is a company who imports Skyline's at a relatively reasonable cost. 

But why buy an Altezza when you can get an IS300 for cheaper, and make
it far faster with the money you would have spent? Toyota is bringing
the Lexus name to Japan. Perhaps they will soon be building IS300's!
Fairlady? Get a 350-z, drop $10,000 into it.

i only asked about the altezza and fairlady because I can them very
very cheap as well as the skyline.

I live here in Japan and used cars here are both in amazing condition
and at amazing prices.

For example, you can get a 3000 mile Mitsubishi GTO Twin-Turbo here
for $3,000 when the same car under the 3000GT name in the states is
$15,000 or more. You just can't find used cars in the states with so
low miles and in such good condition at such a price.

Deals paralleling this are everywhere here with pretty much every JDM
sports car... and deals like that are worthy of a approx. $1000
shipping cost. However, the real question are the legalization costs,
etc. I've done A LOT of research on this and simply put, there's not
enough information on critical specifics to really resolve this. I
guess the only real way is to just try it... and see what the U.S
importation system does.

I suspect that most cars will be far less expensive to import than the
Skylines. Skylines have very weak bodies and their doors are
paper-thin. I suspect they need some frame reinforcement which will
obviously drive the price up quite a bit. Other than that, it's the
exhaust system and lights, which I can't imagine costing more than
$5,000 (physically, not taking into account money the DOT is going to
pocket)... max, and that's if you do it the expensive way.

The source of all these problems is the drastically lower speed limits
here in Japan, resulting in lower safety standards. Cars converted for
the U.S are probably heavier than originally, and thus handle and
accelerate worse.

I actually emailed the DOT in a couple states... never got replies.