I've always guessed that JWT ran closer to 11-12 A/F. Not sure about the non-turbo apps, but the turbo programs are said to be really rich, you have to have SAFC to tune it better, it is 100% an issue of liability. Same reason why they typically won't raise the rev limit above 7950 (or 7850, something like that). You have to specifically state that 8,000RPM is your desired redline (such as my car).
Guess I'll see how it runs when it comes in. I have a friend that owns a dyno. I'll be posting my numbers and wideband results on the SR20 forum. I plan to do 3 runs before and 3 after the installation of my ECU. After that, if needed, I will decide on purchasing an SAFC.