I'm Putting a 406 Ls in my car and ordered the Speed Engineering long tubes for it. I'm wanting to get them coated before install,I know Jet Hot use to be the big name in it. Who else does it and what's everyone getting for price?

 

Shop around so shipping doesnt kill you. Find an industrial coater in your area and ask them. It will run you $200 to $400 on average.

 

Look at a product called Zybar, you can either have a local dealer do them or you can do them yourself

 

What material are the Speed Engineering Headers comprised of?
Are they a Stainless Alloy?

Are you asking about "Jet-Hot" Coatings for appearance reasons or performance reasons?
There are many, many, many Ceramic and Alternative-Material Coatings available today...
and they can serve many different purposes.

For strictly performance purposes, I have been using a Two-Stage (Inner Coating and Outer Coating) Ceramic Coating System, with excellent results.
The Inside Coating looks like Copper before Oxidizing...
The Outside Coating looks like a dull Steel-Grey.
The Image and Video (YouTube HyperLink) below, show a very similar Coating System:

 

I found a place semi-local to me offers 8 different colors. I wanted it for the heat aspect, hopefully cuts down on under hood temps. I'm getting the headers coated in black hopefully it holds up good. I didn't coat my last set of SLP stainless headers and they don't look that great after 20 years of running them.