Requires exhaust work, is cross-under box necessary?

Honda CB 400 discussion forum:


Requires exhaust work, is cross-under box necessary?

Requires exhaust work, is cross-under box necessary? 
Rob-Canuck said 2016-12-03 04:51 
 
Hi Folks, recently bought a ´78 CB400 Twin. Good condition but needs work. Both exhaust pipes and cross-under box/chamber are shot. Is it necessary to run the bike with the c-u box joining the pipes beneath the engine? Will the bike run normal without it? Thanks, Rob 
 
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