To add vehicle, just export your car model with 'XMD Exporter' script, (re)name that file to any vehicle's name and copy to 'Vehicle Models' folder. If there is no file exists of that vehicle name then it will use Default...
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GTA IV Tool X Handling Editor To add vehicle, just export your car model with 'XMD Exporter' script, (re)name that file to any vehicle's name and