This mod able you to use the nitro in the Single Player, like in the races on Multiplayer mod. Press SHIFT in your car.
v0.2 out. BEFORE YOU CLICK IN DISLIKE, PLEASE TELL THE REASON TO YOU DON'T LIKE MY SCRIPT, WITH THIS I CAN IMPROVE MY WORK!
Developed by Paulo Henrique Kava de Souza, aka PhK.

Requirements:
• Latest ScriptHookV version;
• GTA V in 350 version.

Instructions:
• Put the NitroMod.asi in your GTA V folder;
• Put the nitroMod.ini in your GTA V folder;
• In-game, press the key that you configurate in the nitroMod.ini to able or disable the script;
• Press W and SHIFT or SHIFT to use the Nitro;
• FOR MORE INFOS READ nitroMod.ini.

Changelog:
• 0.2 asking requests, now it's possible:
• Toggle if you want to use SHIFT + W to use the Nitro (useWKey);
• Toggle if you want to see the Screen effect when Nitro is activated (screenEffect);
• Toggle if you want to hear the Sound effect when Nitro is activated (soundEffect);
• Now the Nitro bar will filled more faster (400 milliseconds).
• 0.1 initial script release.

Compatible scripts:
• SpeedoMeter v0.2.

Bugs:
• Report on the comments field or
• Steam: http://steamcommunity.com/id/PhK2012/
• Skype: paulotw2011

The level of the Nitro is the blue bar in the hud (armour), I'll change this soon!

Brazil 2015
P.S.: Sorry for my bad english.
P.S 2.: Yes, my graphics are bad!