Abstract: A connection flange for tubular members is formed as a separate member having a sealing surface formed on the connection flange for sealingly engaging a complementary mating surface, a formed annulus for receiving an end of a tubular member and a radially extending web having openings to enable threaded fasteners to force the flange sealing surface into sealing engagement with the complementary mating surface. A tubular member is sealingly affixed to the formed annulus by welding. The flange is formed of a relatively thicker material than the tubular member to which it is affixed to provide material and weight savings by enabling the tubular member to be formed of a relatively thin, light weight material.

Abstract: A tubular exhaust gas manifold for an automotive internal combustion engine comprises pipes with flanges for bolting to the side of the engine to separately receive exhaust gas from individual cylinders, the other ends of the pipes being bunched together and welded to a collector that provides a common mixing and outlet chamber for the gases and has a flange for connection to an exhaust pipe. An air feed means is mounted on the pipes and it takes the form of an air log supported on the pipes by means of the air runner tubes that deliver air separately to the individual pipes.