VandykeT/A

The headers on my camaro were on it when I bought it and so was the Y pipe. I'm curious if they're anyway to tell what brand they are. They have the 3 bolt collector flange and the only set I've seen with that is Flowtechs but these don't have the rattle on the passenger side like the Flowtechs I've had before. Are there anyway to tell what they are? They have the emissions provisions on them as well.