When two boats share the same hull type — in this case both the Alumaweld Intruder Inboard 2009 and the Alumaweld Intruder Outboard 2011 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 — Alumaweld Intruder Inboard 2009 at 18,0 ft versus Alumaweld Intruder Outboard 2011 at 20,1 ft. Weight tells a clearer story for trailering families: the Alumaweld Intruder Outboard 2011 tips the scales at 1 895 lbs — 1 743 lbs less than the Alumaweld Intruder Inboard 2009 at 152 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.
Both boats share a closely matched power ceiling — 200 hp for the Alumaweld Intruder Inboard 2009 and 200 hp for the Alumaweld Intruder Outboard 2011. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Alumaweld Intruder Inboard 2009 carries 47 gallons versus 6 gallons in the Alumaweld Intruder Outboard 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 Alumaweld Intruder Outboard 2011 is rated for 6 passengers, while the Alumaweld Intruder Inboard 2009 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Alumaweld Intruder Outboard 2011 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Alumaweld Intruder Inboard 2009 comes in at 1 lbs per hp versus 10 lbs per hp for the Alumaweld Intruder Outboard 2011. 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.
The Alumaweld Intruder Inboard 2009 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Alumaweld Intruder Outboard 2011 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Alumaweld Intruder Outboard 2011 if your priority is putting more people on the water — it handles 6 passengers and at 20,1 ft it has the deck room to back that rating up comfortably. The Alumaweld Intruder Inboard 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.