[gliding_serpent]

I understand the concepts behind the benefits of extrude hone, and I understand that it would only benefit when the air need of a cylinder exceeds the capacity of the plenum with the poorest flow (assuming there is not a more significant upstream bottleneck). I.e is is of benefit in cars with more power, and presumably other upstream intake mods.

So my question is, has anyone mimicked this process (the original process uses abrasive clay) without cutting open the intake, polishing, and then re-welding? i.e. has anyone mechanically polished the intake with a flexible abrasive device like a metal brush (think chimney sweep for lack of better terms).? Sure it would be imperfect, and challenging in the plenum bends, but I am just trying to think about a feasible alternative that does not involve 1K after shipping my plenums across the continent.

With the right gear, you could still flow match, and even if you did not, blindly polishing all plenums, even a bit, would improve flow rates and at least raise that ceiling where the cylinder air demand exceeds the capacity of the plenum with the poorest flow.

Another way to look at this is, for those that had an extrude hone flow report, which plenum/cylinder had the lowest flow pre hone? I know people report differences as high as 30%. I suspect there will be a pattern there as some are further from the throttle body than others. My logic here would be the "poor/lazy mans solution" to hone out only the plenums with the lowest expected flow. Again, raising your ceiling. Sure, you would not know how much you raised it, but you would.

thoughts and experiences would be appreciated. This is an exercise in mental masturbation as much as anything.