it does seem to work but is is considered “porting”.
If you have some fruity definition of “porting” then it might not. I’m going to assume any means of removing material from a “port” to improve flow can be called “porting”.
It looks like it’s used more for surface finishing than removing gross amounts of material. Like for clenaing up castings. http://www.extrudehone.com/auto/auto-performance.php Or after the main porting is complete, this may get you that extra few percent. I haven’t actually seen numbers though, so this is just guessing on my part. Of course, if you can’t get to an area to port by hand/machine, then this process is an alternative.
But yeah, I think we’re getting into nitpicking of what words mean.
Damn Engineers :love:
yep its all on what you consider the word PORT to mean.
Extrude hone from my experiences in the thirdgen TPI world does some GREAT stuff to TPI intakes. it takes out the material in flow restriction spots well, and greatly improves flow and power. there has been some good dyno tests on this that i’ve seen posted. This would imply that it would be very effective for ALL airflowing intake manifolds as Domination has stated, the stuff flows like air and any restrictions would be cut away more effectively than other spots
So in summary, Domination is a good choice for 1Slo’s porting. 
this thread makes me chuckle