This mod allows you use a "Turbo System" similar to "NFS: Hot Pursuit 2" in Grand Theft Auto V.
 
 GTA V Online 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 (https://www.dev-c.com/gtav/scripthookv/) 
• Extract "TurboSystemV-1.1.3.asi" & TurboSystemV.ini into the game main directory; 
• Launch the game and enter a vehicle. 
• PRESS 'T' TO ACTIVATE AND LEAN BACK WHILE ACCERLATING!
   
  Controls:
   
   Keyboard 
• ' T ' - Activate turbo
• SHIFT + ' T ' - Open SETUP menu
   
   Gamepad
• 'DPAD DOWN' - Activate turbo

Losing enough speed will terminate the turbo so you should press / tap on the acceleration key.
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FAQ:  
 
Q: Can you decrease / increase the speed?
A: SETUP menu in-game provides speed customization.
 
Q: but I don't understand all those bars in the SETUP menu.
A: Check out the image in GTA5-MODS.
 
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: Visit 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: 
 

• Highlights:
• - New turbo mode is available from NFS: Rivals. The turbo kicks in faster but the duration is shorter. (NEW DEFAULT)
• - Improved menu aesthetics.
• Minor:
• - The menu settings effects have been slightly reduced.

V1.6.5a (April 12, 2016) 
HOTFIX: Notification message flickering resolved.

V1.6 (February 25, 2016)

• Highlights:
• - Flames are now currently come out of the exhausts.
   (Old exhaust can still be used by changing the settings in the ini file)
• - Initial speed boost has been reduced by 60%.

V1.5.4 (June 19, 2015)

• Highlights:
• Removed the option to enter SETUP via gamepad.
  Minor:
• Rewrote ini file to be more clear.

V1.5.3 (June 11, 2015)

• Highlights:
• Reworked notification system content.
• Gamepad hopefully works nows.
• SETUP is now entered by pressing (SHIFT + T)
• The mod now shows a one-time message that can only be removed by opening SETUP menu.
• Added the option to completely disable minimap notifcation in config file.
• Added an img that explains SETUP menu.

V1.5.2a (June 10, 2015)

• IMPORTANT: Gamepad is still not functional
• HOTFIX: Fixed a bug affecting Windows 7

V1.5.2 (June 10, 2015)

• Highlights:
• Gamepad is now supported!
• EMERGENCY STOP feature can not be activated if you press 'T' again while turbo is active. REALLY COOL.
• If you didn't like the slow time effect when the turbo "warms up" you can now disable it in the config file
   by giving "Slow_Mo_Start" var a value of 100.
• Minor:
• Settings have been altered a bit you can press 'E' in menu to reset them to the old ones.

V1.5.1 (June 08, 2015)

• Highlights:
• HOTFIX for V1.5: Boost speed now provides the intended speed boost.
• Code optimization.
• You can now save your changes in SETUP menu!
• 
  V1.5 (June 07, 2015)
• Highlights:
• 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.

V1.1.4 (June 05, 2015)

• Highlights:
• You should really check out Slow-Mo Collision from previous patch. (Slow_Mo_Collision = 0->1 )
• Bug fix that prevented changing key bind.
• After burner default duration reduced by 1/4.
• Minor:
• Changed "end_with_slow_effect" to "Slow_Mo_Collision" in config file.
• Notifications bug fix. "Recharing"...
• Added images in img sample.

 
V1.1.3 (June 05, 2015)

• Config file editable during gameplay.
• Added notification for activating while still recharging or when the vehicle is totaled.
• Removed the function "scriptUnregister".
• When you are about to have a collision, the game will slow down time and speed it back up after. (Credit: TheLask)
• Added testing files (sound removed).
• It was always "(June 05, 2015)".

V1.1.2 (June 04, 2015)

• Added slow time effect after activating the turbo (EPIC!!!)
• Reduced the sensitivity of the turbo, it won't stop so easily now.
• Reduced effect volume.
• Reduced even more recharge time.
• System notification when loading the mod.
• Slight increase to the muzzle flash size.

V1.1 (June 04, 2015)

• Added after burner speed for airplanes, helicopters and boats. (Rocket boats)
• Added a sound effect when the turbo ends.
• Better placement of the muzzle flash.
• Reduced minimum and default recharge time by 100 cycles.