how do I "Tilt" this while moving


While moving in “Horizontal” and “Strafe”

using UnityEngine;
using System.Collections;

public class HoverMotor2 : MonoBehaviour {

    public float speed = 90f;
    public float strafeSpeed = 90f;
    public float turnSpeed = 5f;
    public float hoverForce = 65f;
    public float hoverHeight = 3.5f;
    private float powerInput;
    private float turnInput;
    private float strafeInput;
    private Rigidbody carRigidbody;


    void Awake () 
    {
        carRigidbody = GetComponent <Rigidbody>();
    }

    void Update () 
    {
        powerInput = Input.GetAxis ("Vertical");
        turnInput = Input.GetAxis ("Horizontal");
        strafeInput = Input.GetAxis ("Strafe"); 

        if (Input.GetButtonDown ("jump")) {
            Debug.Log ("Space is pressed");
        }

    }


    void FixedUpdate()
    {
        Ray ray = new Ray (transform.position, -transform.up);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, hoverHeight))
        {
            float proportionalHeight = (hoverHeight - hit.distance) / hoverHeight;
            Vector3 appliedHoverForce = Vector3.up * proportionalHeight * hoverForce;
            carRigidbody.AddForce(appliedHoverForce, ForceMode.Acceleration);
        }

        carRigidbody.AddRelativeForce(strafeInput * strafeSpeed, 0f, powerInput * speed);
        carRigidbody.AddRelativeTorque(0f, turnInput * turnSpeed, 0f);

    }
       
}