Last month, the Department of Energy issued a "Showerhead Enforcement Guidance" related to flow standards through consumer showerheads. You see, it turns out that "efficiency standards" tend to upset people, as it usually leads to products being outlawed that people really like.
What happened was that certain showerhead manufacturers were taking a bit of creative license in interpreting the definition of a "showerhead," and selling showerheads that (by the DOE's standards) exceeded the maximum allowable 2.5 gallons per minute.
Sound familiar? The tragedy of low-flow showerheads was brought to light on Seinfeld way back in 1996 (the original regulations were put in place in 1992). Sorry, Kramer, but the Department of Energy is going to force you to keep going to the black market for your high-powered showerhead needs.