Topic: CB550F '76 - 1st Rebuild

[Smudgemo]

If you can keep the headers, I think you need a 60mm muffler opening (just going by memory.)  Most of the ones I've seen are a lot smaller than that.  I haven't replaced mine yet because only the rear cone is rusted away and it looks mostly okay, but I'd sure like to have a replacement that looks similar and is quiet like a stocker.

[flatlander]

you won't find an exact replica of the 550F muffler. also a stock used one is very hard to find, it will be a long search. if you really want a stocker, probably the best thing is to get a temporary replacement and then keep looking for one.

if you are willing to replace the whole system then delkevic makes an alternative at a very fair price.
but you probably want to keep the original header which is a very characteristic design, right?

[Little_Phil]

A lot of mufflers combine the 4/1 collector and muffler as one part. This is not the case with Delkevic as their muffler is separate. It has a large diameter and have been wondering if it will fit the large dia collector output from the 550F pipes. There are a couple of different mufflers that are available as a separate part.
I have an F but the pipes are away being fixed so I cannot measure, but think like above it's about 60mm dia. and there is a gasket there.
www.delkevic.co.uk/index.php?route=product/product&path=1_1050_1439&product_id=39171&Title=Full+Exhaust+System+to+fit+CB550K+FOUR+%281974-1976%29+with+Classic+Straight+Universal+Silencer+and+Stainless+Steel+4-1+Downpipes&SKU=COM320A
Cheers.