Two models, and the step between them is the largest in the Boston Whaler range. The 325 Conquest is the boat you can own without rearranging your life around it: 32'3" on a 10'8" beam, 26" of draft, 300 gallons of fuel, 46 gallons of water, 12 gallons of waste, 10,500 lbs dry and 14,290 lbs loaded. Its transom height is 25 inches, the shortest of the eight current models, and it is rated 600 to 850 hp for 14 people. Twin 400 V10s take it to 55.8 mph, and twin 300 V8s cruise it at 31.3 mph at 4,000 RPM.
The 405 Conquest is more than twice the boat by weight. 41'4" on a 13'6" beam, 22,400 lbs dry and 30,360 lbs loaded, with 620 gallons of gasoline and a separate 38-gallon diesel tank feeding the generator — which is the tell. Boats meant to come home at dusk do not carry a second fuel system. Fresh water roughly doubles to 90 gallons, waste goes from 12 to 30, capacity to 20 people, and the power ceiling to 1,800 hp. Triple 600 V12s put it at 61.5 mph with a 36.0 mph cruise at 4,000 RPM, and the 19-degree deadrise at the transom is what makes that usable in a sea.
What the jump actually buys is nights aboard. The 325 sleeps four or more using a convertible V-berth and a mid double berth, with a VacuFlush head. The 405 gives you a master stateroom with a door on it, a mid-berth for three, and an enclosed head with a separate shower. What it costs is water and dock: 30 inches of draft against 26, and 13'6" of beam against 10'8". Buy the 325 for weekends and day fishing you can run yourself. Buy the 405 when the boat has to be somewhere for a week at a time.