INSTALLATION:
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1) Use OPENIV to edit files

2) Open vehicles.img located in [your GTAIV folder]\pc\models\cdimages

3) Replace taxi.wft and taxi.wtd

4) Save

5) Use Notepad to edit handling.dat located in [your GTAIV folder]\common\data

Change the taxi-line to:

TAXI 2500.0 5.0 80 0.0 0.0 -0.05 0.0 5 0.12 1.0 130.0 0.15 0.60 0.3 30.0 1.10 0.85 17.0 0.15 0.48 1.7 0.8 0.8 0.15 -0.16 0.0 0.5 1.0 1.0 0.8 1.5 0.0 22000 4008 0 2

Use Notepad to edit vehicles.ide located in [your GTAIV folder]\common\data

Change the taxi-line to

taxi, taxi, car, TAXI, TAXI, VEH@STD, VEH@STD_LO1_LO1, 100, 999, 0.2400, 0.2400, 0.3, 2, 1.2 ,2, ext_sunroof+ext_strong

In file [Game folder]\common\data\carcols.dat

taxi, 112,112,112,