I bought my 1990 200sx last year in Holland, so I had to go through a series of import procedures. A bit of a hassle, but I know what to do now (in case my next car will have to be imported too...). The hassle was worth it, I must say. I love this car! It's fun, it's fast and it looks great.
The car already had a stage 2-chip, a K&N air filter (needed to be replaced badly), Forge dumpvalve and a Garrett T28 turbo. The engine itself was completely redone and had about 4,000km on it when the previous owner sold it.
I wasn't planning on changing that much (again) but after a while I realized that a car like this just needs tuning to increase the fun-factor :-D

A list of the specs and what I added/replaced:

Engine (1.8 16-valve turbo):
- Stage 2 chip
- AEM dryflow air filter
- NGK spark plugs w/ shortened gap
- HKS EVC 3 electronic boost controller
- Saab front mounted intercooler
- Forge dumpvalve
- Battery relocated to trunk
- Japspeed 3" freeflow catback (soon turboback)
- silicon connectors/reducers/tubing
- IC hard pipes

Turbopressure set @ 0.9bar/13psi for street use.

Interior:
- Boostgauge
- Oil temperature gauge
- Oil pressure gauge
- Nismo black alu shift knob
- trunk interior removed
- Apex'i turbo timer

Exterior:
- roof repainted metallic black
- Sleepy eyes
- tinted rear windows

Chassis/drivetrain:
- Tenzo-R DC6 black 17" wheels
- Falken FK450 215/40 tyres
- Tokico blue gas shocks
- TEIN S. Tech lowering springs
- TRW brake pads
- Exedy racing clutch
- 180sx VLSD
- Driftworks locking collar kit

ICE:
- Alpine head unit
- front speakers replaced with Kenwoods
- rear speakers replaced with Kickers

What's to come:
- Cusco front & rear strut bars
- Rossini brake discs
- turboback exhaust
- OMP steering wheel w/ quick release hub
- more chassis bracing...

The car on the day I drove it from the Netherlands to my place in Belgium:

Selfmade fitting for the replacement Kenwood speakers:

3" exhaust and the new Tenzo-R DC6 wheels:

A pic of the Alpine HU and Nismo shift knob:

Tokico Blue shocks and TEIN springs:

Exhaust:

Apex'i turbo timer:

Gauges installed in center vent

Sleepy Eyes

Some other pics of the car: