We are in need of a toilet that is both narrow (<17" wide) and more important, with a POWERFUL flush (don't ask). What are the important factors determining flush power? GPF? Trap diameter? Pressure assisted? Any suggestions for specific models?
-ElZed

Why only 17"? Is it set in an alcove? Code requires 15" from center of toilet to a wall or cabinet, that's a 30" space.