I know it's an old thread - but we installed the Oxygenics shower head this past week and tested it out over the weekend. +100 to all the comments about this shower head.
It increases pressure without increasing water flow. My wife and I took back to back showers without fear of ending up in a stream of icy water! If you were on the fence about this shower head - do it!
It bolts up to the stock pipes in about 2 mins. I did just changed the hose forward and mounted it using the stock hardware.
2011 Berkshire 390BH-60
Cummins ISB 360hp/800ft-lbs DEF