I put in an American Standard with the 4" flush valve (CAUTION YOU HAVE TO ORDER THEM FROM AS). That sucker could flush a water buffalo turd I am telling you. I can put a hurtin on a toilet and it has never ever clogged once. 4" flush valve allows more water in the bowl faster than a 3" flush valve. Though I think RiponredTJ might need one with the 5" Flush valve.
I'm not Sheldon! I'm the Flash! And now I'm going to the Grand Canyon to scream in frustration *takes two quick steps* I'm back