I know this is sort of a weird metric, but if you take a given carmaker and look at the horsepower of every production vehicle they’ve made, you can see their spread of horsepower. Most long-running car companies have a pretty large spread, but nobody beats Bugatti.
Take Volkswagen, as an example. They’ve built and sold cars that have a power range from 25 HP (the very first 1100cc Beetle) to more than 400 in the Phaeton. That’s a good spread, but it’s nothing compared to Bugatti.