Jet Hot is an excellent product-- I had the 16V manifold I'm currently running on my truck Jet Hot Sterling coated about 8 years ago and it still looks great.
But it is by no means the only game in town when it comes down to Thermal Ceramic Coatings.
I've had several intakes and headers coated by Finishline Coatings
http://www.finishlinecoatings.com/ with good results.
They are local (just down McLaughlin from Discount Import)-- saving you the cost of shipping as well as being substantially less expensive than Jet-Hot.
Another ceramic coating option (highly recommended) is Swaintech.