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Last year when we had our outrage 20" empowered with a 2004 Yamaha two stroke 150 I inquired about the fin on the motor above the prop. The mechanic told me the fins force the bow down resulting in loss of top speed and more labor for the engine? I am sure this is unique to different setups? I have never had a problem with the boat standing on its tail or rising and lowering while underway. If at all, bow rise happens minimally and can be corrected with the trim of the motor.