It’ll work Great. My 9.9 is converted to a 15. With an 11p stainless prop it will get up to 32mph. With 2 people i swap back to factory prop that will push it 28 with just me, 2 people around 23-25. I wouldn’t want anything less than a 15 on a 13’. I have seen people running 25s on 13’ but not in South Carolina.