Thanks but I think we need some indepth test/reviews of Power Plenums for sub 12 users and do some side by side testing (with and without) - I have a 17cc plenum on a dreamline and I have tuned it to sub 12, by lowering my regulator to about 45bar.
This has saved me about 15 bar which means more shots per fill.
So for sub 12 the plenums can be regarded as efficiency plenums.
I am just down the m4 from your if you want to borrow mine.