1974 Honda CB750 mystery exhaust!!!

[wardog750]

I got my bike together last week after a full top-end rebuild. went to install the exhaust that came with the bike from the junkyard and realized it was not the stock 4-4. it is a 4 into 1 exhaust that sounds amazing!!! I can't find any brand names on it or even a number stamp. It fits the bike perfectly and has no issues with fitment. I could still remove the oil filter and pan to look for chunks after the first couple warm ups. If anyone has seen this exhaust or knows of it I would like to know!! -

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[Remerglobal]

I have a similar- almost exactly the same pipe on mine. Sounds sooooo good. Have no idea who made it

 

[wardog750]

I found out the manufacturer is MAC. one of there high end performance header and exhaust combo. really opens up the top end and is quick. had to jet up 4 sizes on the main and 2 on the piolet. and its an original crime exhaust mad from 1972-77, and no others were made. could be a very rare exhaust!!

 

[Loki]

Looks very similar to the one that came with my bike but was completely rotted out but I used it as a pattern to make a new one in stainless steel.
I moved the collector back a bit and added a £12 Chinese muffler(don't think it does much muffling!).

Loki