Description AussieSpeed 4 stroke short style chrome muffler & top mounted header pipe kit is ideal for Barstool racers, Rear engine go karts & off road buggies & mini bikes. Designed & manufactured in a 2 piece design includes steel clamp & port liner. Delivers good power on stock & mild modified engines. The header has a steel support that bolts to the front of the engine block that is a standard mounting point for Briggs & Stratton Animals Can be used on World Formula Engines but mount needs to be modified if using electric starter.