Thanks, but I guess what I really meant was: does the plumbing need significant reconfiguration to install a gravity toilet? I got a new flushometer when I redid the bathroom but didn't realize how darn loud the thing would be...my old flushometer that was replaced by this new one was really pretty quiet (probably because it was old).
Flushometer toilets are typically installed on a 10", or even less, roughin so you have to measure yours to see what would fit. The water line is also a problem because it goes into the bottom of the tank, not 24" high like yours is.