* For a small, lightweight car: 426 hp would be exceptionally powerful, likely resulting in extremely quick acceleration and a very high top speed. It would be considered very good, perhaps even excessive.
* For a large, heavy SUV or truck: 426 hp might be considered adequate or even slightly above average for a powerful model, but not necessarily exceptional. It would provide good acceleration, but not necessarily blistering speed.
* For a supercar or high-performance sports car: 426 hp is on the lower end of the spectrum. While still a respectable amount of power, many supercars boast significantly more horsepower.
In short, 426 horsepower is a substantial amount of power, but its desirability depends entirely on the vehicle it's in.
