Well...... maybe a member here with a flow bench will be curious enough about this current crop of magnum replacements to get a set and start fiddling with them........ and post the results.
I’d be curious to know(but def not curious enough to buy some) if they are actually a newer revised casting that has 179cc-ish intake runner volume(like advertised)....... or if it’s the same basic casting that Jesse fooled with a few years back that was only like 152cc, and wasn’t any more of a “performance” head than a stock Magnum head.
At some point...... I’m sure there will be answers.
If Indy re-releases the LAX/MAX head....... those will probably end up being a better option for a performance oriented build.
Of course...... there’s also the Ede Magnum Head.