direct comparison. YES its sounds different and is a bit louder BUT you get a lot more power. BIGboxes are mature expansion chamber exhaust ;) so make sure that you have 1) enough fuel! and 2) set the carburettor right.
si carb needs be2 for BIGbox and a be3 for a normal box
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DISCLAIMER: the information shown in this video, is about THIS specific hardware. it is my personal observation documented with this video. It DOESNT automatically mean, that all such parts by this producer or seller do have or will have same issues.
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