Exhaust headers
Headers are made from acid-proof 31,7 x 1,5 mm industry-pipe and 90 degrees turns matching pipe's diameter. Inside diameter matches heads exhaust port diameter (29 mm).
8 mm flange is lasercut by a friend of mine, Mihkail. Cad-drawings still exists but I don't have them - sorry.
Headers are preparation for turbo-install far in future. However, I have not still made final decision for that.