1: First open C:\Program\Rockstar Games\GTA San Andreas\data\maps\vegas


2: And put in the: vegasS.IPL and VegasS.IDE


3: The LAS.VEGAS.SPAWN.cs file is car spawner. Put in LAS.VEGAS.SPAWN.cs in:
C:\Program\Rockstar Games\GTA San Andreas\CLEO


4:In the The LAS.VEGAS.SPAWN.cs file is lot of cars like:
Elegy
Uranus
Jester
Sultan
Supergt
Bullet
Buffalo
Euros
ZR-350
2 firetruck
Ambulance
Towtruck