I've been using a ceramic coating from Central CT Coatings for years with great results on the show field and street. There is a ceramic under coating and a cast grey overlay that not only helps with heat deflection but also looks great. I did run in material cracking issues on a big cube big block but that was isolated to breaking the motor in on the dyno with the coated manifolds which is not suggested. Nice product.
http://www.centralctcoatings.com/index.html
Dan