Sea Ray SLX 400 Boats For Sale

The Sea Ray SLX 400 is a large dayboat built for entertaining, offered in both inboard and outboard configurations under the names SLX 400, 400 SLX and SLX400. The inboard version measures 39 feet 9 inches with a 12-foot-1-inch beam, while the Sea Ray SLX 400 OB runs 41 feet 11 inches overall on the same beam. The design pairs a true bow rider seating section forward with a cabin below, avoiding the elevated walkthrough and tall enclosed bow of older cabin cruisers. It carries up to 22 people for a day on the water and sleeps four overnight, which suits buyers who want deck space and social seating over a large cabin.

The inboard Sea Ray 400 SLX uses twin MerCruiser 8.2L Magnum engines rated 430 horsepower each for 860 horsepower total, paired with Bravo 3 dual-prop drives. It holds 250 gallons of fuel and 50 gallons of water, draws 44 inches with the drives down and 33 inches up, carries a 21-degree deadrise, and weighs 20,794 pounds. The Sea Ray SLX 400 outboard runs triple Mercury 300 or 350 horsepower V8 Verados; with triple 300s on 16-by-18 props, top speed reached 51.8 mph at 5,900 rpm. Best cruise came at 4,000 rpm and 32.9 mph, burning 34.8 gph for 0.9 mpg and a range of 319 statute miles while holding a 10 percent reserve of the 375-gallon tank. The outboard model planes in about 4.8 seconds, hits 20 mph in 6 seconds and 30 mph in 9.5 seconds, with an empty weight of 18,537 pounds.

The helm carries a soft-touch dash with dual Simrad evo3S multifunction displays, a Simrad VHF, digital throttle and shift, and a joystick for docking. The NaviOp system handles digital switching for lighting, pumps, tank levels and the power terrace, and the Auto Glide trim tab system manages running attitude. Dual helm seats, each 24 inches across, have flip-up bolsters and swivel. A Seakeeper 3 is optional with stringers pre-built to accept it, and the Fathom e-power system adds 22 kilowatt-hours of lithium-ion capacity to run air conditioning, grills and refrigeration. Air conditioning and a generator are standard.

The stern features a swim platform that extends 16 inches from the transom, with a power-actuated terrace whose teak fold-down wing adds three feet of beam and converts to a deck for watching swimmers. The cockpit includes dual electric grills, a stainless single-basin sink, dual refrigerators, wraparound L-shaped seating, and solid wood expandable tables. A standard hardtop sits 6 feet 7 inches off the deck, with optional sunshades and an extendable aft awning.

Below, the cabin offers 6 feet 3 inches of headroom, a forward convertible berth that drops to a bed, a midberth that sleeps two more, a 32-inch TV, refrigerator and microwave, and a head with a wet shower and Corian counter with a vessel sink.

For pricing, 2024 outboard examples ranged from the high $700,000s to about $945,000 well-equipped, while 2024 inboard boats ran roughly $680,000 to $720,000. Used Sea Ray SLX 400 inboards from 2021 have been seen in the $400,000 to $500,000 range. The model carries a three-year manufacturer warranty and a 10-year structural hull warranty.