I'll make it short. I have a custom waterjetted jdm twinscroll header flange coming my way to build a custom rotated uppipe that will bolt on to the jdm ts header and have a t4 ts flange on turbo side.
What are some tubing options for me? Material, o.d., I.d., thickness...? What's the most cost effective material and what would be the cream of the crop material???