Cjisntgay presents to you:
McLaren MP4-29
replaces Airtug in the game
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all the model credits goes to McLaren Mercedes
convert to GTAIV by cjisntgay
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noteworthy features:
HD car model
Realistic chrome livery
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Known problems:
Niko can only enter the cockpit at right side,if anyone get any other problems 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:airtug)
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:
AIRTUG 691 0.8 85 0.0 -0.5 -0.5 0.5 8 0.78 20.0 360 1.0 0.65 1.0 30 2.0 2.2 14 0.12 0.47 3.5 2.5 2.5 0.07 -0.06 0.0 0.5 0.55 1.0 0.55 0.6 0.0 190000 400010 1004 1
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VEHICLES.IDE:
airtug,		airtug,		car,		AIRTUG,		PCJ,		VEH@STD,	VEH@STD_RI1_LO1,		1,	0,		0.215,	0.215		0,	2,	1.0	,0,	noboot+ext_conv
PS:The PCJ value means the sound being used for the car, change the PCJ value to other game name value(e.g."SUPER" refers to Super GT)if you want to use other car sound.
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CARCOLS.DAT:(at car3 section)
airtug,	 6,0,0,
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Then now enjoy with the car!