These are often found on sites like Nexus Mods or YouTube tutorials. They add an in-game menu (usually opened with the 7 key) that lets you add money or spawn items.
If you prefer not to mod your files, you can use these fast in-game methods: skachat mod na dengi dlia mafii 2
This is the most user-friendly option. It features a "Set Money" cheat that automatically detects your game version. You can download it from the WeMod Mafia II page . These are often found on sites like Nexus
Take any car to Mike Bruski's scrapyard (marked 'B' on the map) and use the crusher to get roughly $400 per car. skachat mod na dengi dlia mafii 2