From what I understand, PVC out-gasses chlorine when it's heated, as it is by underhood temps. It's not good for the engine, but I'm not really sure how bad it is, either. James has a DIY PVC intake on his car, and he hasn't had any problems from it yet. But I would use ABS ove PVC, just to be on the safe side. One thing, though, I can't think of what PVC braided hose looks like or is. Could you explain or put up a pic?