Cjisntgay presents to you:
Porsche 911(991) RSR
replaces Comet in the game
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all the model credits goes to Firemonkeys(Real Racing 3)
convert to GTAIV by cjisntgay
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noteworthy features:
HD car model
Realistic WEC #92 livery
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Known problems:
none ,if anyone get any problem with this mod, leave your feedback at:gta4-mods.com
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How to install:
First BACKUP all the stuff you want to edit or replace!
Then using SparkIV or OpenIV to open the archive "Grand Theft Auto IV\pc\models\cdimages\vehicles.img" and replace any cars you like(example:comet)
Lastly browse Grand Theft Auto IV/common/data and open the following files with notepad, replace the following lines for the car you replace.

HANDLING.DAT:
COMET 1245.0 4.5 85 0.0 0.0 -0.53 0.5 7 0.5 1.1 325.0 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:
comet,		comet,		car,		COMET,		COMET,		VEH@LOW,	VEH@LOW_INFERNUS,	1,	0,		0.2540,	0.2540,		0,	1,	1.0	,0,	sports
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CARCOLS.DAT:(at car3 section)
comet,	 133,0,0,
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Then now enjoy with the car!