Do not use PCV pipe, I had it on my front mount IC setup temporarily and the heat warped it and softened it and it leaked air after that. I have 2 1/2 inch mandrel bent exhaust pipe with rubber hoses to piece them together until I get them welded together, they work fine but they are only rad hoses (2 1/2 truck rad hose) so they collaspe during idle and exp[and during throttel, but no balloning that I can see. If you use rubber hose get the hoses from a transport truck that are used on the turbo trucks, they will handle the boost no problem.