The Monterey 318SS 2009 is a deep-V design and the Monterey 400SY 2009 is a modified-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.

Size is the most obvious dividing line here. The Monterey 400SY 2009 measures 41,0 feet overall (2009), giving it roughly 10,0 additional feet of deck space compared to the Monterey 318SS 2009 at 31,0 feet (2009). Weight tells a clearer story for trailering families: the Monterey 400SY 2009 tips the scales at 22 000 lbs - 14 000 lbs less than the Monterey 318SS 2009 at 8 000 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 435 hp, the Monterey 400SY 2009 has a 115-hp advantage over the Monterey 318SS 2009's 320-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Monterey 400SY 2009 carries 330 gallons versus 142 gallons in the Monterey 318SS 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.