I could see the logic there give or take a few tens of horses, but 225-400??? That wouuld result in one helluva heavy 225 horse engine.......
Bear in mind this manufacturing efficiency has been kicking around since the '60s on everything from 1.5hp up - only difference being back then you had to either tweak the spark, or mechanically stop the throttle about 3/4 of the way open. (and in the age of electronic ignition tweak the trip levels a bit so it goes into "limp - home mode" before it actually became the next HP up
Nowadays, with fly-by-wire, the throttle is electroniocally controlled so it;s just down to writing the software. I could see legal implictations with the dealer programing the horsepower, especiually if the vehicle emissions regs regarding OEMs' overall output are similar to those for outboards.