Cjisntgay presents to you:
Lamborghini Aventador LP700-4
to replace infernus in the game
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Model credit goes to Ghost Games(Need for Speed Rivals)
Editing and converting to GTAIV by cjisntgay
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noteworthy features:
HD exterior & interior model
L1,L2 models incorporated
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How to install:
First BACKUP all the stuff you want to edit or replace!
Then use SparkIV or OpenIV to open the archive "Grand Theft Auto IV\pc\models\cdimages\vehicles.img" and replace any car you like(example:turismo)
After that browse Grand Theft Auto IV/common/data and open the following files with notepad, replace the following lines for the car you want to replace.

HANDLING.DAT:
INFERNUS 1575.0 4.5 85 0.0 0.0 -0.53 0.5 7 0.35 1.1 285.0 0.68 0.66 0.7 35.0 1.70 2.15 15.5 0.12 0.48 3.0 2.5 2.5 0.10 -0.14 0.0 0.5 0.55 1.0 0.55 0.5 0.0 1600000 60440010 00000001 1
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VEHICLES.IDE:
infernus,	infernus,	car,		INFERNUS,	INFERNUS,	VEH@LOW, VEH@LOW_INFERNUS, 1, 0, 0.255, 0.255, 0, 5, 1.0 ,0, sports
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CARCOLS.DAT:(at car3 section)
infernus,	127,0,0, 1,0,0, 131,0,0, 0,0,0, 69,0,0, 31,0,0, 128,0,0, 113,0,0, 3,0,0, 
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Enjoy with the car after finishing the steps!

If you have opinions about this modification, leave your feedback at:gta4-mods.com.