The material cost of making a complete schedule 40 manifold is much cheaper than making a tubeular stainless manifold.

You should never use simple mild steel tubing for a turbo manifold,so ,that would not be a viable option.

Ask a fab shop to make a stainless tubeular turbo manifold for you,it will shock you about the price.

Just in stainless tube material alone w/out my exhaust flange.
I have about $350 IIRC,as it has been a while since I ordered these tubes.

Shocking is Burns prices : http://www.burnsstainless.com/304tubing/Ubends304/ubends304.html
Here is SPD : http://www.spdexhaust.com/

You also can buy stainless schedule 40 tubing,but cost more $$$


MBHD

12 port SDS EFI