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I don't believe it is just a truck thing. I had a 4 banger in my last dakota and it was considered "magnum" but was just the bigger one at 2.5L instead of the smaller 4 banger at the time
You're probably thinking of the 3.9l LA series Magnum V6 which made 175hp in the 2nd gen Daks. The Powertech 3.7l makes 210hp in our trucks, I imagine it will be replaced with the new Phoenix V6 in the future.