Piranha propellers are 17% stronger than aluminum props but less than stainless. Piranha propellers will outperform most aluminum propellers and in some cases, stainless. Users have noted very little difference in performance from normal
The big advantage of Piranha props is the easy fix if a blade gets damaged. You can take apart the prop and replace a single blade. Simply remove the propeller nut, push out the damaged blade and slide in a replacement blade using a wooden mallet. In minutes you can be on your way.
There is a Piranha for nearly every outboard and sterndrive application from 9.9 - 280 hp. Also offered is the Volvo Duoprop for DPS and XDP drives. Piranha props are being used by government agencies such as the US Navy Seals, USCG and Dept. of Fisheries to marine engine builders such as Volvo.