I have not experienced issues running 20+ minute sessions, though when I think about it the 4 days I did were on under 80°F ambient temp days. I do know a couple other buddies that have been tracking their OGs and they haven't observed a noticeable impact from heat to write home about.
A larger Intercooler and a hi-flow downpipe with stock tune is what I was thinking as well. Keep it simple. Reliability is key when it comes to track days.
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