When two boats share the same hull type — in this case both the Alumaweld Intruder Sportjet 18 2008 and the Alumaweld Intruder Sterndrive 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 Sportjet 18 2008 at 18,0 ft versus Alumaweld Intruder Sterndrive 2011 at 20,1 ft. At 152 lbs and 226 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 225 hp, the Alumaweld Intruder Sterndrive 2011 has a 50-hp advantage over the Alumaweld Intruder Sportjet 18 2008's 175-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Alumaweld Intruder Sportjet 18 2008 carries 47 gallons versus 6 gallons in the Alumaweld Intruder Sterndrive 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 Sterndrive 2011 is rated for 6 passengers, while the Alumaweld Intruder Sportjet 18 2008 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 Sterndrive 2011 could be the deciding factor.
Bottom line: Choose the Alumaweld Intruder Sterndrive 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 Sportjet 18 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.