Need help with header ID

[Vettenut]

I am having trouble identifying a LT header that I recently purchased used. The owner bought them in 2001 and doesn't remember the manufacturer. I've looked through the major header manufacturer websites but my headers don't seem to match any of them. I would appreciate any help in identifying the brand and giving opinions on their performance. Also, what high flow cats are a good value with this application. My '97 already has vararam, Magnaflow x-pipe, Borla Stingers and I will soon be installing these LT's along with an LS6 manifold, ported TB, cam or H/C.

Thanks again