Description Subaru KX21 4 stroke Gokart engine performance header pipe. This press bend header pipe suits subaru go kart engines & increases performance & torque for use on road type courses where rpm varies. The AussieSpeed Subaru Chrome plated finish go kart engine header pipe has a fully welded spring coupler for easy fitment of AussieSpeed AS0280 long muffler. This go kart exhaust pipe fits all subaru / robin over head cam engines to ex27