Q. TDUPE is not working?

Yes it is, but unfortunately i've stumbled across an issue i thought i would have. This issue happens when the database has over a thousand entries, which is the case, since TDU Platinum's database has 1105 entries. So, to use TDUPE, you must follow these steps:

    To run TDUPE, you must open it as admin.
    Point your TDU database directory in the settings and click load.
    Once it has loaded the database, search for the Custom Car you replaced in the car list.
    Modify and Click save. (That is when the problem starts.)
    Because TDUPE can't deal with more than 1000 entries in the database, it will make the game crash, to fix that issue, you must open TDU Modding Tools File Browser.
    Extract the CarPhysicsData.db, located inside the DB.bnk.
    Decrypt CarPhysicsData.db using TDU UT (this tool i did not provided, but it can be found on the forums)
    Open it using notepad and set the number of "Items" as 1105, save and close.
    Encrypt the file again, using TDU UT.
    Replace the new CarPhysicsData.db inside the DB.bnk.