Replace the following handling line of the "handling.dat" file from the game directory (C:\Program Files (x86)\Rockstar Games\Grand Theft Auto IV\common\data\handling.dat) with a text editor:

ORACLE 2000.0 5.5 85 0.0 0.0 -0.30 0.0 5 0.2 1.0 190.0 0.4 0.68 0.5 35.0 1.20 0.95 13.5 0.15 0.48 1.9 1.2 1.2 0.1 -0.1 0.0 0.5 1.0 1.0 0.8 1.5 0.0 25000 440080 0 0