Abstract: An air injection pipe assembly adapted for delivering atmospheric air to the exhaust manifold of vehicle engine comprises a manifold air tube having an inlet and a plurality of spaced outlets. An air inlet valve having an outlet pipe is snugly projected into the manifold air tube and crimped thereto. A plurality of irregularly shaped air injection tubes at their one ends project into the manifold air tube outlets respectively and are brazed thereto and a flair fitting is secured upon the other end of each of the air injection tubes adapted for projection into spaced openings of a vehicle exhaust manifold for securing thereto. The method of making an air injection tube comprises the steps of forming a manifold air tube into U-shape and assembling the outlet of an air valve into one end of the air tube and annularly crimping one end of the manifold tube around the outlet of the air valve.

Abstract: A chatterless shifter structure having an index selector plate, a shifter bracket and a shifter extension of stamped metal. The shifter bracket and shifter extension nest together and are fabricated to act together as a single lever element rockable out of the plane of arcuate movement to selectively free a tab for selective engagement with the index plate. The pivot is cushioned and insulated against vibration and sound.