In regards to my setup, since it is the only part of the exhaust tract that has not been modified (ie. enlarged), I'd expect some power gains, how much remains to be seen.
Say you have a setup with a standard exhaust manifold that is pushing the turbo to its limit at the top end, with boost falling off near redline, would this mean that most of the gains from extrude honing be made in the midrange?
What do you guys think?