Has anyone had experience with using this process on a V8V intake manifold? Seems like it could be beneficial, but I have no idea if this manifold is a restriction (i.e., if properly designed, a manifold should be able to supply enough air volume regardless of whether the plenum walls are smooth or not).

https://www.extrudehoneafm.com/gallery/

 

Save your $, it looks good and works for some applications but I doubt it does much on the large open plenum of the vantage. You may see a marginal flow but you will need tuning with fuel to notice anything.