last picture looks to be a branding stamp where it is threaded into the aluminum.
I have a 6k camaro build for my father in law done by a shop here in nj that uses the same exact fittings for the vac distribution. They might not look pretty but they are way better than any plastic autozone fitting (have had many boost leaks from them
I have a 6k camaro build for my father in law done by a shop here in nj that uses the same exact fittings for the vac distribution. They might not look pretty but they are way better than any plastic autozone fitting (have had many boost leaks from them