*HANDLING*

Go to C:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\common\data (or whatever your gta iv folder is located in)

Find "Handling.dat"

Open with notepad

Find the line corresponding to the slot you installed the car on.

Replace the line with the one provided

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*VEHICLES*

Go to C:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\common\data (or whatever your gta iv folder is located in)

Find "Vehicles.ide"

Open with notepad

Find the line corresponding to the slot you installed the car on.

Replace the line with the one provided

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*CARCOLS*

Go to C:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\common\data (or whatever your gta iv folder is located in)

Find "Carcols.dat"

Open with notepad

Find the line corresponding to the slot you installed the car on.

Replace the line with the one provided