It does look like the Jonway pipe would fit, but you could likely pick it up for less on Taobao.
The cat and the AIR-style device. It is the tube on the cylinder head, just in front of the spark plug, and it injects a puff of air into the exhaust stream to assist the cat. I'd block it off.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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