First Watch

https://www.youtube.com/watch?v=kTJ87mewfPo

Description:
This mod allows you use a "Turbo System" similar to "NFS: Hot Pursuit 2" in Grand Theft Auto V.
Effects - slow time, initial boost, wrap effect, muzzle flash, engine boost for a couple of seconds with turbo sound.

Future updates:
CRITICAL: Massive FOV increase in wrap speed.
^(Can't figure it out yet, would appreciate your help)
Unique boost for each car model.
Better muzzle flash effect.
gamepad support.
Increase traction while turbo is active.
Engine silence while the turbo is active.

Tested and working on the retail version as of May 04, 2015: version: 1.0.350.2 (Update 5) with DLC.

WARNING:
This is a cheat, DO NOT USE IT WHILE PLAYING ONLINE UNDER ANY CIRCUMSTANCES.
gamepad is not supported.

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Installation instructions:
Find your GTA V installation folder (e.g. C:\Program Files (x86)\Steam\SteamApps\common\Grand Theft Auto V). It should have files like GTAV.exe and x64
Requires Alexander Blade Script hook v (http://www.dev-c.com/gtav/scripthookv/)
Extract "TurboSystemV-1.1.3.asi" into the game main directory;
TurboSystemV.ini is optional, if you wish to change any values.
Launch the game, enter a vehicle and wait for the Turbo system to recharge (~15 seconds)
PRESS 'T' TO ACTIVATE AND LEAN BACK WHILE ACCERLATING!
Controls:
'T' key ; (Can be changed in ini file)
'F3' key to enter SETUP menu (Can be changed in ini file)

Losing enough speed will terminate the turbo so you should press / tap on the acceleration key.
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Known issues:

(May 04, 2015): Alt-Tabbing during a boost will not halt the turbo sound.

(May 04, 2015): Normal engine sound during turbo launch is not intended.

FAQ:

Q: Can you decrease / increase the speed?
A: You may alter the settings in the ini file. Everything is clearly explained in the file.

Q: how do I uninstall this?
A: Delete both of these files from your GTA V installation folder.

Q: Where do I get the latest version?
A: You should check https://www.gta5-mods.com/scripts/turbosystemv-ultra-nitro for the latest version.

Credits:
Alexander Blade for script hook v and SDK.
GTA forums.
EA's NFS: Hot Pursuit 2
Johnny Manson for providing script hook v template. (And a YouTube video)

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Patchnotes & logs:

V1.1.5 (June 07, 2015)
Highlight:
Added graphical interface! F3 to activate or change in config file. NOTICE: CHANGES INGAME WILL BE LOST UPON GAME RESTART ONLY CHANGES IN THE CONFIG FILE WILL BE SAVED.
Slight warp speed effect increase.
Press 'E' while in SETUP menu to reload settings.
Minor:
Removed redundant options in the config file.
Removed testing files.
Reduced img sample size.