Create a second Folder for your work with "OPEN IV", put in there the GTAV exe - files and the copy of "update.rpf", located in the following folder.....(so OPEN IV wont destroy your game and u have a copy of your files to edit !!!

Use OpenIV and locate this folder: update > update.rpf > common > data. Find a file called "Handling", right click it and choose to Exchange with mine !!


For editing DLC cars handling-file then go to x64w.rpf > DLCpacks > choose the one under common data.
Don´t let open IV run on your gamefolder, it damaged my game more than one time !!!

If you exchanged the ahndling you can spawn the infernus and enjoy, I promise A LOT OF FUN :-))))