Here is a tutorial on how to install new cars in vice city-
1. Download VCMM - Here's the Link
2. Install it.
3. Download any car from Here which has (VCM) at end of it.
4. Put the .vcm file in the .................\vcmm\mods\vcm folder.
5. Start Vice City Mod Manager
6. Select the installation place of Vice City.
7. Double click the car name.
8. Select the car to replace.
9. Its done.
10. MOST IMPORTANT STEP : HAVE FUN!!!
Please reply if you have any comments or doubts.
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Here have a tpyo XD