I'm looking at my data in trackmaster, average speed at Pocono IMSA (full course): 92mph. 30minute session yields no more than 250F w/STETT stg2. This will no doubt vary by driver level and no doubt there are plenty of drivers out there that will push much harder that what my data above logs. None of the other tracks in this area yield similar avg speeds for comparison.
As long as you're qualifying your statement that the ER dual core is the 'only
one that seems to be good enough' to apply to your level of driving, then we're golden
For some of us, the STETT stg2 kit has already proven sufficient.