Been doing some research... there seems to be very, very little information about the benefits of this... Along with some disappointing back to back dynos. Pretty concerning considering how long it's been around. "Best kept secret" or flop? Might be a better option to get the Xcessive weld-on plenum that keeps longer runners.
https://www.xcessivemanufacturing.co...et-s13-wi.html
Also, just FYI hypertune plenums have very little bottom end loss from what I've seen. Greddy's just kinda suck, at least for S13 SR, but that's not a popular opinion, hahaha.