I did not find this mod, MaDmaX found it and linked me to it.
This is simple, the mod replaces the origional "visualSettings.dat" file with the modified one.
The mod makes the car lights look similar to real life Xenons
(http://i433.photobucket.com/albums/qq59/crayzie/1241397716_RealisticXenon01.png)
(http://i433.photobucket.com/albums/qq59/crayzie/1241397716_RealisticXenon02.png)
Here is the origional lights.
(http://i433.photobucket.com/albums/qq59/crayzie/ivmp-020916-25012011.png)
And the modded lights
(http://i433.photobucket.com/albums/qq59/crayzie/ivmp-021504-25012011.png)
(http://i433.photobucket.com/albums/qq59/crayzie/ivmp-021606-25012011.png)
To install it, simply goto "C:\Programs Files\Rockstar Games\Grand Theft Auto IV\common\data" in that folder place the file called "visualSettings.dat"
overwriting the origional file.
Ive tested it and it works perfectly on IVMP aswell. ;)
Click Here To Download:
Click Here! (http://www.gtagaming.com/downloads/download/2506)
If you wish to go back to the origional lights:
Click Here! (http://www.mediafire.com/?v0ta89vsq3ij57q)
~Regards
Devin Leone