Description Subaru KX21 4 stroke Gokart engine performance header pipe part number AS0281c Aussiespeed AS0278c short series muffler & clamp kit. This press bend header pipe suits subaru go kart engines & increases performance & torque cross the rev range but is louder than the long exhaust kit This is a chrome plated full exhaust system for Subaru ex17, ex19,ex21, ex27 & kx21. includes pipe, muffler & clamp