650/X-2 set back prop question

[Austin]

How much does a sxr hooker need to be set back for it to work in a 650 pump?

 

[Twinturbostang]

It's cut off the front splines and cut off the back. Just send it to impros it's the easiest way

 

[Austin]

I found a prop that has been set back 5mm didn't know if that was enough for what was needed. How much needs to be done to finish it off