It looks similar to racing beat but the slimmer collar down by the lower flange says otherwise to me, and the O2 bung placement was a little different than the current cheapies I could find on ebay, any suggestions or need a different angled pic?

 

Almost all downpipes are going to be 3/8" flange, 16 gauge ss. Why don't you try fitting it. If it fits, no cracks or dents, then its good. You can take a magnet to the flanges and see if they are also ss

 

It came off a TII engine so I know it fits, just curious for purposes of selling, but thx for the tip on checking the flanges!

 

If it's a RB, it would have a RB mark on the flange.

What is the ID at either end?

 

if it fits well, I would use it, it's pretty much just a pipe. a lot of quality manifolds still use steel flanges, not because of cost, but mild steel warps less than stainless. stainless is beautiful though

mild steel is perfect for exhaust application, just not as pretty and gets corroded over time

sorry, got off topic. Almost started on manifolds