Yeah, I did this lol.

INSTALLATION (This is optional cuz I've already included this on the page from where you got this savegame):

1.Download the file

2.Extract the RAR file and all files expect README.txt

3.Go on your taskbar

4.Type "File Explorer Options" a option might be visible with that name, click it.

5.Click on the tab "View"

6.Scroll down, you might see a option saying "Show hidden files, folders and drives" (THIS OPTION IS DISABLED BY DEFAULT), enable it.

7.Close the Window and go to the drive where all your Operating System's files are located.

8.Click on the folder "ProgramData"

9.Click on the folder "NFS Underground"

10.Paste the files in that folder.

And done, when you start the game, the car will be waiting for you.

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Credits to nglxzef/ExOptsTeam for making NFSU Extra Options.