This is the first global mod for gta sa, which was made in September 2008, when there was no GTAIV on PC yet! I advise you to combine this mod with the GTA SAN 4 mod.
They pulled out the Liberty City map from GTA3 and inserted it into gta sa. Replaced Niko's model, cars from gta4, abilities and all that... But wait, in the future I will post information about GTA SA in which liberty city will be converted from GTAIV !!! (and then, finally, a real GTASAIV mod will appear, and not small collections of different mods!) Download and enjoy!