When two boats share the same hull type — in this case both the Alumacraft Navigator 165 Sport 2007 and the Alumacraft Navigator 175 Sport 2006 are modified vee designs with aluminum construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

On paper these two are close siblings in the size department — Alumacraft Navigator 165 Sport 2007 at 16,0 ft versus Alumacraft Navigator 175 Sport 2006 at 17,0 ft. Weight tells a clearer story for trailering families: the Alumacraft Navigator 175 Sport 2006 tips the scales at 1 345 lbs — 1 240 lbs less than the Alumacraft Navigator 165 Sport 2007 at 105 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 150 hp, the Alumacraft Navigator 175 Sport 2006 has a 60-hp advantage over the Alumacraft Navigator 165 Sport 2007's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Alumacraft Navigator 165 Sport 2007 carries 22 gallons versus 4 gallons in the Alumacraft Navigator 175 Sport 2006. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 5 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.

At this size, power-to-weight ratio matters more than outright horsepower. The Alumacraft Navigator 165 Sport 2007 comes in at 1 lbs per hp versus 9 lbs per hp for the Alumacraft Navigator 175 Sport 2006. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.