I use this on a yoshimura RS-5 on my 2013 CBR600RR. Fit is absolutely perfect no need for force it in, one of the ribs is sized perfectly for this exhaust. It is a soft rubber compound so it grips and stays in there very well. Deffinately a must have for the RS-5
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I bought this product because of the advertised 4 stroke compatability. Well made bung however it's too large for my ktm 350. When installed it only allows 2 rungs to enter the muffler making it heavy on the back end and it falls out. Disappointed purchase.
There have been no questions asked about the Oxford Bung 4 Muffler Plug.