Don't get me wrong, I think extrude honing is a great process, but a talented porting technician can do a better job in every respect including final finish. One of the huge advantages of porting is that you can better alter and control shape. You just don't have much control over that with gritty putty getting forced through a port. Any claims about a better finish with extrude honing is just in someones mind. In areas that you don't have good access to, like the twists and turns in many manifolds, it can be a completely different matter. At least that is my opinion.
