I have a 2075GS with a Yamaha 90hp. The original prop is an aluminum 13 5/8 X 13-K. It runs good so I figured a stainless would do good. Far from it. the prop it terrible. It is a Yamaha pontoon prop and was shown to be the best for a pontoon boat. I am just going to buy a new aluminum unless someone is having better luck with a stainless and can let me know what y'all are using. Thanks