Not Ranked
On my ERA, I did everything I could: ceramic coated headers, dynamat in the inside, aluminum skinned insulation on the outside, and extra venting on the inner fender panels (an option from ERA). I think it did a good job, but can't compare very well since I did it as I built the car. For me, the majority of the heat I can't handle comes from the sun beaming down on the black interior! Sitting at a red light in the summer at mid-day is a killer!
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