I am not aware of anybody selling just a mid-pipe for the CRF230. You generally buy the header, the muffler as a slip on - which includes a mid pipe, or a full exhaust.
The easiest way to put an aftermarket muffler on an otherwise stock exhaust will require you to fabricate a pipe from where you cut the stock muffler off to where the new muffler entrance would be.
Or, buy the ebay exhaust, currently found for 99 bucks, which then allows you to slip fit any muffler you want on the end.
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