If you have one of those brass barrel type pressure regulators, look into one end and you will see a solid square piece. That is the end of the PRESSURE regulator mechanism. Look into the other end and you will see a washer looking thing (could be metal or plastic) with about a 1/4 inch hole in it. That's the FLOW reducer. Don't be confused by the hose washer. That's not what I'm talking about.
The flow regulator is a feature brought to you by some long-ago craven national legislators trying to curry favor and money from a special interest group. (Could have been Sierra Club. Don't know).
Now, DON'T, UNDER ANY CIRCUMSTANCES, go in there with a larger drill and carefully increase the size of the flow reducer hole. That would be illegal. :W