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I have a 2003 18.5 MA with Yamaha 150 2 stroke. It came with a 23p Tempest 3 blade prop. 45ish at 5400rpm loaded down. I am not happy with the hole shot and wanted to try a 4 blade. After doing a bit of reading I decided to try a Powertech. My local boat dealer/service guy called Poertech and they are suggesting a 15p with my set up................19p is what I had in mind.....Anyone with a similar set up?