GTA 5: NOS on Horn

//------------ A correclty functional NOS option for GTA 5 ------
//
// Activates on horn press
// Has sound effects as well as screen effects
// AddSpeed variable allows you to set how much speed we need to add
//
// VehicleNOS is our Bool to Set
//-------------------------------------------------------------

Bool VehicleNOS;
int NosTimer = 0;
int AddSpeed = 50;  // Range of 0 to 100 is advised

VehicleNOS()        // Function needs to be in loop
{
    int NosTimer = 0;
    int AddSpeed = 50;  // Range of 0 to 100 is advised
    if (NOSonHorn)
    {
        int veh = PED::GET_VEHICLE_PED_IS_IN(PLAYER::PLAYER_PED_ID(),0);
        if ((PLAYER::IS_PLAYER_PRESSING_HORN(PLAYER::PLAYER_ID())) && (GAMEPLAY::GET_GAME_TIMER() > NosTimer) && (VEHICLE::IS_VEHICLE_ON_ALL_WHEELS(veh)))
        {
            int NosTimer = GAMEPLAY::GET_GAME_TIMER() + 2000;
            AUDIO::SET_VEHICLE_BOOST_ACTIVE(veh, 1);                       // Add sound effect
            GRAPHICS::_START_SCREEN_EFFECT("RaceTurbo", 0, 0);             // Add Screen effect
            float Speed = ENTITY::GET_ENTITY_SPEED(veh) + (float)AddSpeed;         // Calculate new speed
            VEHICLE::SET_VEHICLE_FORWARD_SPEED(veh, Speed);                  // Set new speed
        }
        else if ((GAMEPLAY::GET_GAME_TIMER() <= NosTimer))
        {
            AUDIO::SET_VEHICLE_BOOST_ACTIVE(veh, 0);                       // Remove Sound effect after 2 seconds
        }
    }
}