I've used the DEI hi temp coating on my wrap extensively. It works very well.
It's really a one time use item, so don't plan to store the can after you've used it. During application the nozzle will plug, so you need to keep turning the nozzle in the top of the can to keep it flowing.
There are various products for header wrap coatings. Volcanic ash, and so forth. If you look carefully at the heat ratings and how they insulate, you will likely find something that suites your application. Some of them are mighty pretty too!
I haven't used a blanket for the duals on the head pipes, but do use a similar blanket over my starter in conjunction with wrap on the head pipes and the DEI coating. So far, no problems or complaints. My under-hood temperatures are substantially lower, and my tailpipe exhaust temperatures are much, much higher. Don't put your hand over the tailpipe after I've made a pass!
CJ
