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Since you're having heat issues and don't want to lower the boost I would suggest ceramic coating as your next option to keep temps down.
A guy I know runs track days at Sebring in the middle of summer here in Florida and doesn't have too much of an issue after he ceramic coated pretty much everything on the hot-side of the motor. He said the temps in the engine bay dropped by more than 20*
You could also try running E85 since it keeps the combustion charge way cooler.
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