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you should be able to fix that water box with JB weld or a fiberglass repair kit. But there are plenty of aftermarket options out there if you want to go that route also. I dont think an aftermarket wb will improve your performance much without other upgrades also so i dont know if it really matters. just make sure its for the correct years of 550, the exhaust exits at a different place on the earlier ones. (pre 1986 i think)

There is not a "bilge" pump per se but there is a scavenger pump that works on a venturi effect from the jet pump to suck water out.(Venturi effect - Wikipedia, the free encyclopedia). so to get max water sucking, you need wide open throttle.
 
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