Dave M is right, but, if you have the 46" hull at slow speeds you might find a lack of cooling, due to the long distance to the motor's, a pump will cure this, but, look for a low watt pump, 10 L PM will be fine. I like my outflow at the stern as the exhaust but it can be masked with the propwash

Mark

A correctly positioned scoop just aft of the propeller and a side exit pipe will work fine. Makes sure the exit is above the waterline but about level with the motor outlet pipe to avoid air locks.