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SUGGESTION: MAKE A BACKUP OF THE FILES YOU'RE GONNA REPLACE BEFORE INSTALLING THIS MOD OR YOU CAN INSTALL THE WHOLE GAME AGAIN!

Did you check your roots before uploading? I have several files of your pack that should not be there. In fact, the game crashes at launch telling me: "Game Files broken!"
:facepalm:

Didn't wanted to take this topic so far and clutter up your comments page,
I'm sure you'll find a way to get it best for you. p.s. Unfortunately there is no post editing function here. I wanted to edit the part where i wrote "(~0.300)".....i meant -0.300 from the original value (example: If original DriveInertia value is 1.000, set it to 0.700 or something like that). KeepUp!

Maybe this reference pic (handling GTA IV) can help you:
[URL=http://www.directupload.net/file/d/3985/5tnjzckl_jpg.htm][IMG]http://fs2.directupload.net/images/150512/temp/5tnjzckl.jpg[/IMG][/URL]

I just did the changes for the Dubsta in my game and by increasing InitialDragCoeff (a lot...from 7.500 to 30+), decreasing DriveInertia (~0.300),it gave me a smoother acceleration at higher top speed. If you want i can send you my settings for the debusta so you can try it out and see the changes.

~Cheers~

Hey there! Just a FYI: Best way to decrease accelleration imo is to play with the DriveInertia value (lowering to decrease) and InitialDriveForce value. Hope this will help you. Keep going, Matt!