Let me rephrase.
I want someone to do before/after measurements on the same unit on a calibrated measurement rig, like a B&K or something. The differences Marv shows in his measurements could easily be attributed to unit-to-unit variation.
I also want to see someone take it apart and actually show what JAR is doing. He was charging a lot of money for what is probably just a piece of 3d-printed plastic and some dampener. If he didn’t want to do the mod anymore, he should have released the STL file along with instructions on how to do it.