Did a bit of a search though nothing that recent, anyone used any companies for applying a ceramic coating to a turbo and headers for an Impreza lump, any recommendations or idea on cost? Finally got my VF48 for an engine build project and want to make it look nice as well as more efficient thermally.

Try Camcoat - they seem reasonably priced. No experience though, technically it's a good idea if you're careful of heat issues within the turbo.

Could try these guys, Zircotec

http://www.zircotec.com/?source=adwords&gclid=CKG6uNKzjbECFRMgtAodmVZGiA

lots of stuff on pistonheads about ceramic coating...

http://www.pistonheads.com/gassing/gsearch.asp?q=ceramic+coating&searchBtn=++++Search++++