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Cobalt 343 (2004-)
(w/ 2 x 425-hp MerCruiser 496 MAG HO)

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Brief Summary

Cobalt blends exquisite appearance and aggressive performance with its new 343. This high-performance boat will steal your breath away, not only with her speed, but with refined features and captivating style.

Key Features

  • 10 Year Hull/Deck Warranty
  • 5 Year Powertrain Warranty
  • Closed Cooling System-Twin Engines
  • Composite Transom
  • Fiberglass Stringer System
  • Kevlar Reinforced Hull
  • Hydraulic External Steering
  • Ignition Safety Switch
  • Gaffrig Engine Controls
  • GPS Unit
  • Double Wide Helm Seat
  • Extended Swim Platform
  • AM/FM CD stereo
  • Specifications

    Length Overall 35'4''
    Beam 9'8''
    Dry Weight 10,200 lbs
    Tested Weight N/A
    Draft 37'' drives down
    - Draft Up N/A
    - Draft Down N/A
    - Air Draft N/A
    Deadrise/Transom 24.5 deg.
    Max Headroom N/A
    Bridge Clearance 69''
    Weight Capacity N/A
    Person Capacity N/A
    Fuel Capacity 200 gal.
    Water Capacity 10 gal.
    Length on Trailer N/A
    Height on Trailer N/A
    Trailer Weight N/A
    Total Weight
    (Trailer, Boat, & Engine)

    Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

    Engine Options

    Std. Power Not Available
    Tested Power 2 x 425-hp MerCruiser 496 MAG HO
    Opt. Power 2 x 375-hp MerCruiser 496 Mag MPI Bravo 1
    2 x 425-hp MerCruiser 496 Mag HO Bravo 1 XR
    2 x 500-hp MerCruiser EFI Bravo 1 XR
    2 x 350-hp Volvo D-6 Diesels

    Test Results - Change Measurement Unit

    RPM MPH Knots GPH MPG NMPG Stat. Mile NM dBa
    650 4.7 4.0 3.1 1.5 1.3 270 235 66
    1000 6.6 5.7 5.2 1.3 1.1 228 199 69
    1500 9.2 8.0 9.0 1.0 0.9 184 160 72
    2000 11.2 9.7 13.8 0.8 0.7 145 126 77
    2500 16.1 14.0 20.8 0.8 0.7 139 121 78
    3000 30.1 26.2 23.1 1.3 1.1 235 204 81
    3500 40.9 35.6 31.5 1.3 1.1 234 203 85
    4000 46.3 40.2 37.8 1.2 1.1 220 192 86
    4500 53.9 46.9 47.9 1.1 1.0 203 176 87
    5000 56.9 49.5 68.4 0.8 0.7 150 130 92
    5100 62.4 54.2 69.2 0.9 0.8 162 141 92
    650 235 435 7.60 11.73 0.64 66
    1000 199 367 10.60 19.68 0.54 69
    1500 160 296 14.80 34.07 0.43 72
    2000 126 233 18.00 52.24 0.34 77
    2500 121 224 25.90 78.74 0.33 78
    3000 204 378 48.40 87.44 0.55 81
    3500 203 377 65.80 119.24 0.55 85
    4000 192 354 74.50 143.09 0.52 86
    4500 176 327 86.70 181.32 0.48 87
    5000 130 241 91.60 258.92 0.35 92
    5100 141 261 100.40 261.95 0.38 92

    All fuel consumption numbers are the total for all engines in the boat. Speeds are measured with Stalker ProSports radar gun or GPS. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter or by on-board factory-installed diagnostic instruments. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation. Time to plane is measured from start of acceleration to formation of rooster tail behind boat.

    Performance Chart

    Performance Chart

    Acceleration Times & Test Conditions

    Time To Plane 5.7 sec.
    0 to 30 9.4 sec.
    Ratio 1.50:1
    Props 24-inch pitch
    Load 3 pers, 1/3 fuel, no water, min. gear
    Climate 65 deg., 60% humid., wind: 10 knots; seas: 1-2 feet

    Cobalt 343 (2004-) Line Drawing


    Captain's Report

    Tested By Capt. Chris KellyCobalt’s attention to detail goes way beyond the obvious and visible. The 343 is going to send chills up the spine of her competitor’s and a thrill through your body as she attacks the water with a vengeance. The 343 is built to deliver high performance style and delivers with attitude. She stays stuck to the water on the straightaway and clings to the water with ease through the turns.Down BelowThe door to the cabin is more like that of a mega yacht or aircraft, no sliding door here! Inside is a port to starboard V-bench. In one corner is an optional flat panel TV for your movies at night. The enclosed head is made up of a portable toliet, sink and vanity.Cockpit FeaturesRear facing bench seats create a large conversation pit at the stern. The seat is double hinged with cavernous storage below. Cobalt leaps to the future with its helm station. This center console is more like an airplane cockpit with a bank of rocker switches to the left and two rows of gauges. Water/air temperature and depth digital gauges are next to the rocker switches. Gaffrig instrumentation and Lavorsi precision engine controls will keep you in charge. The seats have electric lifts that take you from a seated driving position to standing in just a few seconds.The side decks are wide for easy movement and even the fender locker has gas assist lifts. All the deck water trails down the sides and passes through the fender locker and out the bottom to the keel.TransomTwo individual sun pads and two stern benches are divided by a large walkthrough. Double hinged seats also have storage below. An inflator for your water toys is in one, and you have a tool kit in the other. Under the port bench is the battery switches, main breakers and space for canvas poles. Everything has its place on this boat, and each side has cup holders and a horizontal grab rail. The two level transom and swim platform get you close to the water while the wraparound stainless bar protects the boat from the dock and is a great handhold. Flip a lever and the dive style ladder is deployed with ease. Stainless steel vents and fins bring fresh air to the engine while inside the starboard compartment is the swim shower and water hookup. When it comes time to get the engine the hatch lifts easily with one hand.Power PlantThese 496 V-8 engines deliver 425-hp each. Everything is easy to reach with one hand, and the oil filter is on top. Closed cooling is standard. The oil dip stick has an easy oil drain system connection, and the water drain system has an air-actuated single point drain system which had an air pump included. A single serpentine belt drives all the parts. The engine control module uses a Motorola microprocessor and optimizes the fuel mixture, knock control and ignition timing independently for each cylinder resulting in improved, precise performance.SpecsThe 343 is 35’4” overall in length and 9’8” across the beam. Draft is 28” with the drives up and 37” with the drives down. She weighs in at 10,200 lbs with twin stern drives and carries 200 gallons of fuel and is yacht certified.PerformanceThe 343 cruised most economically at 3500 rpm traveling 40.9 mph for a fuel burn of 31.5 gph. At wide open throttle she was turning 5100 rpm and delivered a top speed of 62.4mph. At cruise you can expect 234 miles on a full tank of fuel.

    Test Result Highlights

    • Top speed for the Cobalt 343 (2004-) is 62.4 mph (100.4 kph), burning 69.2 gallons per hour (gph) or 261.92 liters per hour (lph).
    • Best cruise for the Cobalt 343 (2004-) is 40.9 mph (65.8 kph), and the boat gets 1.30 miles per gallon (mpg) or 0.55 kilometers per liter (kpl), giving the boat a cruising range of 234 miles (376.59 kilometers).
    • Tested power is 2 x 425-hp MerCruiser 496 MAG HO.

    Standard and Optional Features

    Marine Electronics

    GPS/Chart Standard


    Air Cond./Heat Optional
    Battery Charger/Converter Optional
    CD Stereo Standard
    Head: Fixed Standard
    Power Steering Standard
    Shore Power Optional
    Trim Tabs Standard
    TV/DVD Optional
    Windlass Optional

    Exterior Features

    Outlet: 12-Volt Acc Standard
    Swim Ladder Standard
    Swim Platform Standard
    Transom Shower Optional


    Bimini Top Optional
    Cockpit Cover Optional

    Boats More Than 30 Feet

    Generator Optional


    Hull Warranty
    Deck Warranty
    Transferable Extendable
    10-Years 10-Year transferable protection No
    Engine Warranty
    5-Year No
    Powertrain Warranty
    5-Year transferable protection
    Gelcoat Warranty
    2-Year transferable protection
    Accessories Warranty
    1-2 Year Yes
    ISO Certification NMMA Certification Yes
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