With just a K&N, thermostat, valve cover breather, AFPR, and cat pipe, I ran a 13.0@104 on Firestone Firehawk SZ50. After installing Nittos and locking the converter, it dropped to 12.6@108. This was straight 93 octane.
With a Xylene mix and more boost, I ran a best of 12.15@111.