Even though I agree with the whole 'anti-300 WHP benchmark' thing, as yes, it is hard to quantify (as Ford ST has stated so well above), and yes, sort of a 'false' psychological feel good point, I can most certainly also agree with the above as well.
I personally will NOT go to any aftermarket turbo unless it gets me at least near that 'magic 300 number' (and 250-260 to the wheels is NOT anywhere
near in MY book!) under ANY/ALL conditions, whether that requires all of the co$tly ancillary add-ons/options or not,
especially for that $3K (or well above) amount of coin mentioned.
Otherwise, it is just
not worth the bother, the greater chances of things going totally 'south' (even with pitch perfect tuning/revisions), and co$t to me, personally, no matter how great it 'feels' at 250-260 to the wheels.