Looks like, my solution on the x360 still works, so I'll share it again
Exports and Imports are a series of side-missions which become available after completing the mission "Customs Fast Track" from Cesar Vialpando, this mission will be
available, once the following requirements are completed:
1. Unlocking "San Fierro"
2. Completing Driving School with at least all Bronze
3. Purchasing Wang Cars (Costs $50,000)
4. Completing "Zeroing In" missions given by Cesar Vialpando
5. Completing "Test Drive" missions given by Cesar Vialpando
There are 3 lists of each 10 vehicles to complete. Almost every vehicle of these lists has a 'spawn-place' in San Andreas which is related to this mission. But, be aware: the vehicle has that spawn-place only when it is on the list which you have to complete at that moment. When you have delivered a vehicle it will not reappear at that spawn-place again. Of course you can see most of the vehicles driving through the streets or parked somewhere else. If the vehicle doesn't spawn, you have to walk away and come back and the vehicle might have spawned.
You will need to unlock "Las Venturas" as well, in order to deliver all vehicles
In this exactly point of the map (Easter Basin, San Fierro):
You will find a board, containing a list with the current cars:
Each wanted list consists of ten different vehicles needed for export. They range from motorbikes to sports cars, and from common to rare.
List 1Admiral
Buffalo
Camper
Feltzer
Infernus
Patriot
Remington
Sanchez
Sentinel
Stretch
List 2Blista Compact
Cheetah
Comet
FCR-900
Rancher
Sabre
Slamvan
Stafford
Stallion
Tanker
List 3Banshee
BF Injection
Blade
Euros
Freeway
Journey
Huntley
Mesa
Super GT
ZR-350
I personally use this map to find some vehicles:
http://gta-sanandreas.com/guides/importexport/map.htmOnce you have the desire vehicle you have to take it to a specific marker on a cargo ship in Easter Basin, San Fierro, where it can be lifted in place via a magnetic dockside crane, or simply driven up a ramp linking the dock to the deck of the ship if the vehicle is compact enough to be driven onto the ship. Once the vehicle is in contact of the marker (and released from the crane magnet, if lifted using the crane), a message will show up that the you have successfully exported that vehicle. Then you will receive money depending on the type and condition of the vehicle.
Credits to gta-sanandreas.com
Reward-Cash is awarded for each car successfully delivered, ranging from $10,000 to $135,000 (with cash deducted if the vehicle is delivered with damage). The player will receive a large cash bonus for completion of each of the lists, ranging from $100,000 to $200,000 per list.
-Delivering a vehicle will unlock a new vehicle being made available for import on certain days. These vehicles range from the vehicle which has just been delivered to the dock, to rare vehicles Carl may only be able to obtain via import which become available for every five cars delivered. These vehicles may be purchased on certain days of the week only, and may be bought during or after completion of the sub-mission by returning to the blackboard. Vehicles purchased appear on the deck of the freighter, requiring Carl to either use the crane or attempt to drive them down the ramp.
-Exporting all 30 vehicles is a requirement for 100% completion of the game.
-And of course the "A Legitimate Business" Achievement