That’s disappointing. I was thinking of something without basalt wool; conformed embossed shielding that’s bolted down to threaded standoffs welded to the manifold flanges. That should keep enough of an air gap to serve as insulation. Either that or sandwich rock fibers between two layers of shielding. I’m just paranoid about the amount of heat that my next exhaust manifold is going to radiate into the engine bay. The way that VAG does it for V10 headers is pretty nice.They fit very tight as they are.
I used DEI shielding, it's horrible and I would actively recommend against using it. It is off the car now. They advertise it and market it as a suitable wrap for exhaust manifolds and it plainly is not. It is embossed aluminum backed with basalt wool, which sounds great. The glue they used to attach them together is flammable and catches fire and burns and stinks. I emailed them about it and all they said is that some smoking is normal.
As for the coils, they do kind of stay in place but wouldn’t want to keep them unsupported. Will look into designing something soonish.