You don't really say why your looking at a new prop, but I'll take a guess that it's to get your boat up on a plane faster, especially when your loaded down & pulling a boarder. It's been a while since I owned an I/O, and I never messed with different props then either. But I did install one of those hydrofoil wings on the outdrive & saw a big improvement in getting the boat on a plane faster. As I recall I lowered my lowest planing speed on an 18' SeaRay from around 17 or 18 mph down to like 12 or 13 mph.
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