People have done everything under the sun to Hondas- I'm sure there are single cams pushing more than 300 whp. Not in stock form or not for long if they are. But no B-series will push 700 whp in stock form either.
Turbo toaster- why not? Somebody buys a car that they like for whatever reason, then they feel like tweaking it. They see an ad for some highly overpriced turbo kit in a magazine, look up a speed shop in the yellow pages and go drop 5 grand on "up to 30 percent more power" or in this case, 25 hp at the wheels.