Can you survive a night on room 1408? The room only has one goal. Will you resist the urge? Don´t trust anything, ...
Addon:
copy to 68mustang folder to:update/x64/dlcpacks
From the update.rpf go to:/common/data and edit the file dlclist.xml and add this line:
dlcpacks:\68mustang\
Replace:
Go to:x64e.rpf\levels\gta5\vehicles.rpf\
spawn name:68mustang