Firstly, Download SAMI (San Andreas Mod Installer). SAMI supports car mods. After downloading, download the file of the mod (suggested "vehicle"). After downloading, you receive a ZIP file or a RAR file. Open up SAMI, Click "Download Mod" or something, afterwards browse the ZIP mod file, Then click ok until you get a message "Play San Andreas". I will post the pics later since I need to go to the church and buy a cake.