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There are a lot of opinions on prop material type. The majority of mechanics I have as colleagues tend to frown on them from the standpoint that the prop will withstand a hit, but even with slip hubs (or drive/shear pins), it ends up putting more stress on the gearbox and generally damaging the gearbox moreso than an aluminum which would just bend/break.

YES, SS props lend themselves to a little bit more performance, but for an extra 1-2 MPH, not sure if it's worth spending all that extra money not just for the prop, but to fix your gearcase if badly damaged.

Dealerships will encourage customers to buy SS because the profit margin is much bigger both with the prop sale and the ensuing repairs after a collision. I've yet to meet a dealership, even Mom and Pops business, that won't try to squeeze more money out of customers this way.