You can go to... http://www.mafiamods.org/index.php
...click "Downloads," and put "Mafia Swap Program" in the search engine.
You can also get the Mafia Swap Program at:
The instructions have you change a file of the game, then you run the program
At the start of the game. It asks you to enter a number to indicate which mod
You want to use--I enter the number that means I don't have a mod installed.
Then it lets you pick which version of Mafia you want to run.
My copy of "Mafia" was v.1.2 when I bought it, but it can be run as v1, which
Lets you use the +19 trainer, the detour gimmick for the race, and give some of
The mods a try.