I've got two outboard's using K&B 3.5cc lowers. The biggest prop you can run is a X442, the fastest prop is the P-215, that's how it works out on my tunnels. I like to use the O/B engine cowling from the mini F-3 O/B sold here at OSE 10$. My 3S boat runs mid 30's the 4S boat mid 40's and honestly when those boats cruse by under full throttle lookin so kool, the lower unit is the last thing you'll notice. When they get older they get dull gray even less noticeable.
PROBOAT BlackJack 24", ShockWave 26"
MRP U-31, 3 tunnels VS1, MRP Bud Light, Dumas HS Sprint
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