After all the posts and fun we've had with the toilets, I felt it only appropriate to show its secret. The top pic shows the 4" flush valve, which is one of the two key ingredients of the Champion 4 flushing system from American Standard and a full inch larger than its nearest competitor. The other secret is a 2 3/8" trapway, a full 1/4" larger than the competition. I couldn't fit in there to get a picture of it, so I guess the fabled Champion 4 does have its limits after all. 
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