There are ways to keep doing this... Imagine, for a moment, the X-47S. Same thing, but now you get a bigger inlet and 5 more whp. Or the X-47+ that comes with a bigger wastegate disk AND a bigger inlet allowing another 15whp. The X-57 then comes along with all that, and includes a fancy new exhaust housing, that's roughly the same dimensions, but this one is cast specifically for the application and now we've got a hybrid turbo trying to claim 350whp. If Sour responds, this won't stop.
And now I've talked myself out of the iPhone 7 Plus.