I have an opinion here. Now if my X47 gave up the ghost right now I'd get an S280 to replace it mainly because Puma doesn't make the X47 any more but also because their other newer "better and beastlier" products are irrelevant to me because of the next few sentences I'll write. So, on the street 300whp is useless unless you're in 3rd gear or higher because the tires are spinning before that. So yes 300whp is more than 280whp but is it useable? Only after about 45mph. If you're one of those people that races in Mexico into the triple digits on Friday nights, sure get the one with 20 more hp and you'll maybe beat an Audi. For the rest of us, 20 more hp won't matter in most situations because you can't put 280whp down much less 300whp. I have probably the stickiest extra-wide street tires you can get and all the traction mods and I still can't do it. Unless you get 245s or something you're out of luck. And most of us aren't doing that. And LSD doesn't help, it only makes both tires spin instead of one. I've been in those cars.
All I said above means nothing if you're building a drag car and hunting the best 1/4 times with slicks.
Check out Adam Brunson's youtube channel....he put an S280 on his Fiesta maybe a year ago and gives a detailed talk on how/where/why the block needs to be shaved. It's a very minor and simple and safe job, like 5 minutes as others said. Nothing super dangerous or scary. The videos are very enjoyable for any Fiesta owner regardless of turbo choice.
He's a great tuner too and will tune your S280 remotely and your tune won't have Covid19.
@Tune+