the plus has a little more slip than the standard Mirage and has cavitation holes to let it slip more from a stand still. The original Mirage will bog an outboard, where as a Mirage plus works fine on an outboard(thats the whole reason they came out with the Mirage plus)). From the specs you posted using an aluminum prop, I'd say you need a 17P Mirage,
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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