You would have a connector up to the turbo anyway so no direct contact. Should be fine. The only thing is the cold side stuff is easier to make than the hot side, so why not use mild steel? You don't even need to weld it if that is a problem, just use connectors. Of course that will drive the price up. The other thing is to just get your setup up and running with the pvc and see how it goes than if need be replace with steel.
97 Laser Red GT-248A Wingless model, Built Lincoln Mark VIII motor-Procharger D1SC, 3 core IC
2012 Black GT-Saddle, 3.73s, Brembos, Shaker1000