To install this mod 

Go to: \Grand Theft Auto V\mods\update\x64\dlcpacks\mcst\dlc.rpf\data and replace the handling.meta

If you want a real sound for your car follow this steps:

Go to: \Grand Theft Auto V\mods\update\x64\dlcpacks\mcst\dlc.rpf\data and replace the "Vehicle.meta"

Remember backup your files.

By: ChunLi