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Jim -

Just so you know where this comes from. The goal is to prop the engine so that with the typical load, the engine's rpm's will get to or within 200 rpm's of the top of the WOT range. It is not that you are going to go that fast. This means the engine is performing right in whatever rpm's you choose.

Since the Turbo model is NOT offered in 14 inch, I would not get it tweeked. I would go with the Yamaha Performance prop.