Subarus have a steel wire reinforced silicone pipe, aftermarket. It is very thick, and I bet it would hold 50psi++. Looks like it was made in many layers, with some sort of weaved material, and steel wire in the center, blue or red. They make alot of these things, in many shapes in England. They are flexable to join the motor flopping around to a fixed pipe. I think the company is called Samco.
Scott H.