Aluminum 3.5" compressor outlet flange- $35 shipped, bought it for $66.90+shipping. Its picture on the left and I got rid of the exhaust flange pictured.
Also have an aluminum oil drain flange for $15 shipped.
It would be the intercooler pipe, its the piece that clamps to the turbo. I guess it could be used to weld onto the compressor housing if you wanted though.
I ended up using mild steel for the cold pipes on the twin setup I built.
Well it is a little different, I would be curious since your piece is cut for an oring how it would work being mated up to the IC pipe that is cut for an oring also.
Ok yeah it is cut for an oring so it wouldn't work if you are trying to mate it up to another one like it, you'd want the flange with a flat surface I believe. Its made to mate up to the S400 compressor outlet flange.