Hi, I recently bought an MC21 with standard chambers and aluminium tyga silencers fitted. I've since bought tyga chambers and so I have removed the tyga silencers and noticed that there was an aluminum adapter plate about an inch thick that bolted onto the ends of the silencers so that they would fit to the standard pipes. Since I no longer need these adapters I would be willing to part with them if you need them.
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MC21 Honda NSR250. TYGA 300 conversion.