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If you want to 'encourage' exhaust gases to leave the cyclinder,you can tune the exhaust by making a 'Helmholtz resonator'. A suitable size of fat section can do this for you but it means that the engine works well but over a narrow rev range. High performance engines are often associated with gearboxes with many ratios to keep the revs within this range..The reason for the wide bit at the end is probably to allow the gases to move slower than when they come out of the exhaust ports. The lower speeds will generate lower frequencies which are softer to the ear. it also sounds 'throaty' which is associated with a bigger engine. (Virtual performance for boy racers?)
The system you have in your picture is designed for a car not a motorcycle and is a big bore system designed to reduce back pressure