[Locobob]

The Extrude Hone process has both positive and negative aspects.
It would work well inside the plenum which is hard to access by hand.
Smooth as glass... well it looks nice but a high polish is not helpful in promoting intake air flow.
Extrude Hone can not target specific areas - like injector bosses for example.
Bottom line: generally you'll get better results with properly done hand porting.