We switched out the current prop for this new Rapture prop; it's a 13 1/4 x 15P x 3 blade Stainless. We run the boat and check out the performance numbers to see how the engine runs with the new prop.
Check out the first prop test video link:
   • Yamaha F115 Sea Trial and Prop Test  

PERFORMANCE NUMBERS:
Planing RPM: 36004000 RRM
3600 RPM: 1920 mph
4000 RPM: 2425 mph
4500 RPM: 27 mph
5000 RPM: 3031 mph
5600 RPM: 3536 mph
WOT 5700 RPM: 36 mph

Much better numbers than the previous prop. Enjoy!