I did all my twin turbo stuff with Top gun coatings. both turbine housings, hot pipe ect. I used their Titanium ceramic - they say guarranteed to 2000* I'd use nothing less on diesel hot parts.

BUT
I'm not sure it reduced underhood temps any.

 

Did you wrap your hot pipe with header wrap afterwards, or just run it with just the coating?

 

no wrap. I had it wrapped before I got it coated. I hated the wrapped look.