Squeaking Sound Coming from 225 /6

I don't like the plastic lines, and the racing associations do not allow them. Copper lines have a problem, in that they can get fractured from vibration, and "work hardining". Also they can whined up getting a hole burned in it from a electrical short (wrench or bare wire). What I do is use the copper line, run inside small gauge rubber hose, like windshield washer tubing, and make sure there are vibration loops.