I recently bought for my CB400F2 a replacement downtube/collector box complete with gaskets and clamps. What I didn't realise was that the Dunstall muffler I have, which has never been taken off the collector box before, does not use the gasket. A result of that is the original size muffler to box clamp is too large. So I bought two items I can't use,
at least for now. ggrrr!
