I have a 621 ranger with a 300 verado and it came with a tempest 19 and that was about right. I switched to a bravo 1 20 and that works really well. Dramatic difference in those two props the way they run. I had a turbo 1 on my last boat that I switched out another tempest and it worked very well. The tempest had too much lift for that boat and the turbo 1 was about perfect.