[Hugh]

Can I put 195x40x16 on front and 215x40x17 on rear

 

[1983JZR3W]

Yes, you will have no problem on a 451. I have 215/35-17 on all four corners of my 2009.

 

[Miss Mercedes]

Those sizes will physically fit just fine.

However, your front and rear tire choices have a difference in diameter of nearly 2 inches. If your ESP system is intact, this can lead to undesirable behavior like traction control randomly activating.

If you bump the front tires up to 195/50/16, you should be fine. It'll rub a little at first, but that's no big deal. Or just do what 1983JZR3W did and get four equal wheels and tires.