Way back in July 2014, we told you about the original equipment manufacturer’s (OEM) specification replacement four-into-four exhaust system available from David Silver Spares for the 1974 Honda CB350F.

Not only did that system look and sound superb, far better, in my opinion, than many of the after-market systems currently available for that bike, but it also restored the bike to its classic form. The look and sound of the four separate pipes are just impossible to beat.
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Continue here:
https://ultimatemotorcycling.com/2020/11/12/1973-honda-cb500k2-oem-spec-four-into-four-exhaust-review/