This mod sets the Gang Members to drive the cars meant to be used while GTA III was still in Beta Phase. Attached below is a list of what vehicles each gang drives.
Beta Gang Cars
Triads: Sentinel
Diablos: Infernus
Yakuza: Stinger
South Side Hoods Gang: Rumpo
Columbian Cartel: Bobcat
Yardies: Esperanto
Enjoy!