my cousin has an '87 f250 with a powerstroke. It was swapped in by one of the previous owners. All the IC tubing is exhaust tubing that was custom bent. Doesn't look like it was too expensive. Some surface rust on the outside of the tubes, but most of it looks fine after being there 6 years. Not going to win any shows, but it gets the job done
My brothers ATI Procharger kit for his Mustang came with all steel tubing.
Only problem was the paint overspray on the inside of the pipes started flaking off. We had a few paint chips get caught on the MAF hot wire. Not a good thing on a full throttle run. ATI's customer service basically told us it's not supposed to be like that, but tough luck. We ended up having to strip it all ourselves.
Long story short, make sure the inside of your pipes are clean before installing them...
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