Pro Line 3400 SS 1999 vs Pro-Line 18 Flats 2011 - Boat Spec Comparison

Q: Which is the larger boat - the Pro Line 3400 SS 1999 or the Pro-Line 18 Flats 2011?

The Pro Line 3400 SS 1999 is the longer of the two at 35,0 feet overall. The Pro-Line 18 Flats 2011 comes in at 18,3 feet, making it roughly 16,7 ft shorter - a meaningful difference in deck room and overall on-water presence.

Q: Which boat can handle a bigger outboard?

The Pro Line 3400 SS 1999 is rated to a maximum of 300 hp, giving it the larger power ceiling. The Pro-Line 18 Flats 2011 tops out at 115 hp. Keep in mind that maximum ratings are just that - matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

Q: How many people can each boat hold?

The Pro Line 3400 SS 1999 is Coast Guard rated for 10 passengers, while the Pro-Line 18 Flats 2011 is certified for 5. Note that legal capacity and comfortable capacity aren't always the same thing - on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Q: Which boat has the larger fuel tank - the Pro Line 3400 SS 1999 or the Pro-Line 18 Flats 2011?

The Pro Line 3400 SS 1999 has the bigger tank at 300 gallons, versus 27 gallons on the Pro-Line 18 Flats 2011. That 273-gallon difference translates to roughly 819–1365 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Pro Line 3400 SS 1999 and Pro-Line 18 Flats 2011 from the same manufacturer?

Yes - both the Pro Line 3400 SS 1999 and the Pro-Line 18 Flats 2011 are built by Pro-Line. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

Boat Comparison

Pro Line 3400 SS 1999 vs Pro-Line 18 Flats 2011

Pro-Line

Pro Line 3400 SS 1999

1999

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Pro-Line

Pro-Line 18 Flats 2011

2011

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Detailed Evaluation & Buyer Recommendation

Pro Line 3400 SS 1999 vs Pro-Line 18 Flats 2011: Same Brand, Different Boat

The Pro Line 3400 SS 1999 vs Pro-Line 18 Flats 2011 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.

The power gap is worth calling out. Rated to 300 hp, the Pro Line 3400 SS 1999 has a 185-hp advantage over the Pro-Line 18 Flats 2011's 115-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Pro Line 3400 SS 1999 carries 300 gallons versus 27 gallons in the Pro-Line 18 Flats 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Pro Line 3400 SS 1999 is rated for 10 passengers, while the Pro-Line 18 Flats 2011 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Pro Line 3400 SS 1999 could be the deciding factor.

Bottom line: Choose the Pro Line 3400 SS 1999 if your priority is putting more people on the water - it handles 10 passengers and at 35,0 ft it has the deck room to back that rating up comfortably. The Pro-Line 18 Flats 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.

Measurements / Dimensions

Length overall - Detail35.00 ft

Length overall - Detail18 ft. 4 in.

Length - Feet35

Length - Feet18.33

Length overall - Meters10.67

Length overall - Meters5.59

Length overall - Inches420

Length overall - Inches220

Beamnot available

Beam8 ft. 0 in.

Beam - Metersnot available

Beam - Meters2.44

Beam - Inchesnot available

Beam - Inches96

Deadrisenot available

Deadrise13°

Depth - Detailnot available

Depth - DetailCockpit: 11 in.

Depth - Centimetersnot available

Depth - Centimeters27.94

Depth - Inchesnot available

Depth - Inches11

Draft [max] - Detailnot available

Draft [max] - Detail9 in.

Draft [max] - Metersnot available

Draft [max] - Meters0.23

Draft [max] - Inchesnot available

Draft [max] - Inches9

Weight - Detailnot available

Weight - DetailHull: 1,548 lbs.

Weight - kgnot available

Weight - kg702.16

Weight - lbs.not available

Weight - lbs.1548

Engine and Drivetrain

Fuel tank capacity - Gal300

Fuel tank capacity - Gal27

Fuel tank capacity - Liters1135.62

Fuel tank capacity - Liters102.21

Engine makeSuzuki

Engine makeSuzuki or Evinrude or Mercury

Horsepower300 hp

Horsepower90 hp

Fuel typeGas

Drive typeoutboard

Drive typeOutboard

Engine modelnot available

Engine model4-stroke (Suzuki or Mercury engine) E-Tech (Evinrude engine)

Fuel tank capacity - Detailnot available

Fuel tank capacity - Detail27 gal.

Engine maxnot available

Engine max115 hp

Operational Info

Water capacity30

Water capacitynot available

Boat typePower

Boat typenot available

General Boat Info

Makenot available

MakePro-Line

Modelnot available

Model18 Flats

Model Yearnot available

Model Year2011

Body / Hull

Hull materialnot available

Hull materialFiberglass

Hull typenot available

Hull typeModified Vee

Trailer Info

Trailer - Weightnot available

Trailer - Weight2,328 lbs.

Pro Line 3400 SS 1999 vs Pro-Line 18 Flats 2011 - Common Questions

Which is the larger boat - the Pro Line 3400 SS 1999 or the Pro-Line 18 Flats 2011?

The Pro Line 3400 SS 1999 is the longer of the two at 35,0 feet overall. The Pro-Line 18 Flats 2011 comes in at 18,3 feet, making it roughly 16,7 ft shorter - a meaningful difference in deck room and overall on-water presence.

Which boat can handle a bigger outboard?

The Pro Line 3400 SS 1999 is rated to a maximum of 300 hp, giving it the larger power ceiling. The Pro-Line 18 Flats 2011 tops out at 115 hp. Keep in mind that maximum ratings are just that - matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

How many people can each boat hold?

The Pro Line 3400 SS 1999 is Coast Guard rated for 10 passengers, while the Pro-Line 18 Flats 2011 is certified for 5. Note that legal capacity and comfortable capacity aren't always the same thing - on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Which boat has the larger fuel tank - the Pro Line 3400 SS 1999 or the Pro-Line 18 Flats 2011?

The Pro Line 3400 SS 1999 has the bigger tank at 300 gallons, versus 27 gallons on the Pro-Line 18 Flats 2011. That 273-gallon difference translates to roughly 819–1365 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Pro Line 3400 SS 1999 and Pro-Line 18 Flats 2011 from the same manufacturer?

Yes - both the Pro Line 3400 SS 1999 and the Pro-Line 18 Flats 2011 are built by Pro-Line. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

← Pro Line 3400 SS 1999 full specs ← Pro-Line 18 Flats 2011 full specs