I have updated my Gorky Classic 2012 travel story. You can read everything here: http://gaz21.fi/tapahtumat/gorky-classic-2012/
I installed coated manifold when I finally got seals from Retrodetal Saint-Petersburg. I also coated visible part of exhaust so it maybe will last better in good looking. Ceramic coating will last with heat very well and should maintaing original color very long time.