thruster

thruster.cs

[SerializeField]
private GameObject _thruster;
private float _speed = 5.5f;

void Update()
{
Thrusters();
}

    void Thrusters()
    {
        if (Input.GetKey(KeyCode.LeftShift))
        {
            if(_thruster != null) { 
            _speed = 8f;
            _thruster.SetActive(true);
            }
        }
        else
        {
            _speed = 5.5f;
            _thruster.SetActive(false);
        }
    }