Description Aussiespeed short header pipe suit GX120, GX140, GX160, GX200, Clone 5.5hp, Clone 6.5 HP engines, The header pipe is a through flange design that is welded both inside and outside the pipe. A support bracket mounts on to the cylinder head to support the muffler. The recommended muffler for this pipe is AS0278B you are buying a header pipe only The pipe exits in a central location, it has a welded support that runs back to the cylinder head.