I'm not trying to sound like an ass, so I hope you're not taking it that way. But I've read that article before. You're free to take away from that whatever you want, but you should also consider the real world data. There are plenty of Si's that are FBO, tuned on ethanol, and some running...
I couldn't tell you exactly how it rode stock because it's been a while, but I distinctly remember feeling that the car started to feel "floaty" at higher speeds, and I don't feel that anymore.
I run 255/40/18 Pilot Sport 4S all around on 9.5 wide wheels and have no complaints about high speed stability. FWIW; My car is on Skunk2 springs and I also have a BMSpec spoiler extension.
I'm just saying don't be such a stickler. We have people of all ages and backgrounds on this site, and whoever wants to chime in is usually going to. Some of the younger guys actually have quite a bit of knowledge.
To answer your question, these cars redline at 6500 from the factory. This can...
God no, not on the FK8.
In order to safely tune an FK8 on ethanol, some trade-offs have to be made, resulting in similar and sometimes less power than if the car had just been tuned on 91 or 93 octane.
As it stands currently, you can safely push more power on an FK8 using 91/93 than you can on...