Lots of different ways you can take this, but really generally speaking it'll look something like this...
raw water pickup > water pump > (maybe coolers first if forced inducted) > exhaust pre-warm > engine > out exhaust
You might want to run the coolers off of a separate force fed pickup (ie not fed from pump, but boats motion), or maybe move that cooler to a different spot in the chain if your engine is running too cold.
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