1. Go to update\update.rpf\common\data and extract dlclist.xml 
2. modify dlclist.xml 
dlcpacks:\3000gt\ 
3. Go to update\x64\dlcpacks 
Create '3000gt' folder and put the dlc.rpf in created folder. 

You can use Simple Trainer Spawn it by name '3000gt' and '3000gta' (3000gta is camber wheel)