I know that this all depends on the location of the EGT probe, but I'd like to know what max EGT temps everyone is seeing in at the top of third/fourth, and what a general rule of thumb is for running lean.

 

I forgot to add what my own EGT is. Usually it's about 780 at the top of fourth. Probe is right behind stock 02 sensor. I topped 800 a few times before I ported the wastegate (was only dp/mp and cone filter) but as soon as I saw it over 800 I shut down instantly.

 

around 750C at O2. 780 should be fine.