I *think* i've had a 6.25, but in general 6 is as high as I'm 100% sure i've seen it go. I see 6.00 a lot, especially when the ambient temps are below 75 degrees.
I'll try monitoring all my cyls today and see what I can find. It's suppose to not go above 75 here today, so good turbo weather.
Running 93 octane Mobil and Cobb Stage 1 93 V103