I went aluminium for my FMIC piping. Dave if you haven't got your FMIC piping done yet I've got the number to a guy that can get you Aluminium and mild steel manderal bent in most sizes for F all. YOu just need to cut to suit and either weld or silicon them together.
If you got the Aluminium way I can help you out with welding beads around the edge to avoid blowing them. I've welded my aluminium intake piping together with some positioned joiners, but I'm not sure If would fancy welding the compressed side together for you in case it leaked, blew or worse.
Just PM me if you'd like some help or the number.
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