These came off my good friend's 430 coupe. They were installed before he bought the car and had to be taken off when he sold the car. He nor I know what these are. These will be going up for sale as well, so once I have an idea of what they are and a reasonable price is, I will post them up in the for sale section.

If anyone knows what these are and if possible, who made them I would really appreciate it

 

those are the catalysts.

 

Catalytic converters.

 

^ Yup

 

Any idea on what cell cats they are? 100 cell?

 

Yeah those are cats, look stock as well.

 

They aren't.

 

Well then, I don't know.

 

There are no brand markings?

 

Nothing that I could find. And no etchings anywhere either. Judging by the condition of the finish on the pipes, it wouldn't surprise me if any marking had burned off.