On an I/O or outboard they do make a difference, you will plane faster and be able to hold speed better. The down falls are more stress on the lower drive unit and the steering will change. I noticed on one boat we put a "Stingray" brand on the top speed increased but the prop blew out much easier. The other way to do it is to use trim tabs like Bennett makes, but they are more money, although they will allow side to side trim capability.
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