As much as higher rev NA sounds cool, the rod/stroke ratio is 1.54ish on the FA if they indeed kept the same dimensions as the FB, and that's likely not very safe for 8000rpm. If they shorten the stroke to like, 80mm, it could probably be done, but a lot of stuff would need to change to make that happen.

N/A 4 cylinders are just so obnoxiously loud plus power for dollar is never the same.

Or they could put forged vanadium steel rods in it, like they did with the 2ZZGE.

I predict that the STI version engine will be very close to the GT5 specs. (off the top of my head, so the rpms for hp and tq may be a bit off: 220 bhp @ 8000, 170 lb-ft @ 6500, Redline 8500.)