Clone & Honda GX series 4 stroke Chrome plated Gokart engine performance AussieSpeed anti reversion staged header pipe. This 1 inch header pipe suits 6 & 6.5 Honda & Honda copy & clone go kart engines & increases performance & torque for use on both bitumen & dirt road type courses fun & social go karts where where torque & power is required over a wide band.This pipe has been designed to be used on standard governed engines through to mildly modified engines up to 7000 rpm. The AussieSpeed AS0311 go kart performance header pipe is designed to be used with AS0278 short style muffler. you are purchasing the AussieSpeed Power Pipe only. The muffler needs to be purchased separately