About 12 years ago I purchased a new brass/copper radiator from Hall. It is thicker than the OEM and seems to do a good job in cooling. It has been repaired twice for minor leaks. Annoying but better than having to replace the aluminum radiators.
Dick Koch is actually still running his original OEM radiator in his twin turbo. The only up grade I am aware of is Meriah fans. He says he never has cooling issues.
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