To reduce engine bay heat, I'm going to coat some parts in the engine bay with the zircotec coating. www.zircotec.com The manifolds will be done, but I'm wondering if everything should be coated. ie: catalytic convertors and the exhaust system. Is this a good thing to do or should I just leave it on the manifolds. Has anyone had the coating applied to their car and if so, did it reduce the engine bay temprature?