Not sure at what HP emissions comes into play?? Plus I would guess the bigger motor costs more and I have to agree my BX is never having a power problem.
Im not saying the 23hp needs more power but I wonder why the 2670 has the bigger engine. Dosent have a backhoe. I would just think the 25 would need the extra power for the hoe..
I somewhat think it is also marketing. People that owned a 25hp Craftsman figure that they need at least another tractor with that much "power."
Little do they know......