I don't think any of these will be worth anything and even giving them away for free won't be of any value to anyone.
The first four are from a 1978 CB550K. 2 of them are rusted through on the muffler. The other two are not. If I could identify the two that are not I could sell them at best or give them away at worst.
The next two are from a CB 350, most likely twin but I see they are different pipes so I don't really know anything other than they are from a CB 350.
I just want to identify what I have and determine the best course of action. Edit: Photo of second pipe wasn't able to post. File size was too big.