Have a look over at this website they may be able to help you out.

http://www.sstubetechnology.com/ceramic-matrix-composites/

http://www.sstubetechnology.com/integrated-heat-shields/

Otherwise you will have to look at a metallic heat shield and try and wrap it but as above most thermosets dont like high temps so you may need to look at thermoplastics?

The absolute highest Tg laminating resin I have ever seen commercially available is around 200C. Axson make some as do Airtech. I expect you MAY be able to get hold of some that can go up to the high 200's, but I would be extremely surprised if there is anything out there that can do much over 300C.

Anything that can handle the temperature that exhaust headers would see is going to be a carbon ceramic material. 

Not gonna happen mate unfortunately, you're beyond the capabilities of any thermoset resins. There are companies out there producing extreme high temperature carbon fibre products like F1 brakes and cladding for space shuttles, but they aren't using resins anymore they use ceramic technology like carbon fibre reinforced carbon (carbon fibre in a graphene matrix rather than a polymer matrix).

As an idea, NASA pay something like US$100,000 per sq/ft for the stuff... So if you find somebody offering an epoxy capable, I'm sure NASA would like to know too! Haha

I've spent about the last week researching resin's for a very high heat application with little success.  Highest temp range I've seen is approx 600-700*f.   Any suggestions on brands, or otherwise would be appreciated.  The project is an exhaust pipe with the header section (first 12" or so) reaching up to 1100* for brief durations of 2-5 seconds.

Second thought, I've also reached out to several chemical manufacturers for heat reflective coatings, however dead end there too.  

Third idea, cf skin a steel section where exposed to the extreme heat, but would the bond with the steel still seep into the resin and soften or fail?