I respect what Jason has contributed to our sport, but I don't believe he is an authority on ceramic coatings. As for his testing, he states the coated and ground areas were side by side. This could definitely allow radiant heat from the uncouted area to influence the "infrared pyrometer" readings over the coated areas----who knows. Bottom line, coatings do work. I have experienced this first hand for many years. If guys don't believe, than that's OK. As for me, I'm sold. My engine bay is cooler, it's that simple!