I‘ve used heat shrink tube and created a collar at each end of the tubes as a way to add a little extra stiffness and resilience to the ends. It also presents a tidier appearance than the cut ends especially when using the fabric braided tubing. Might just be voodoo, but I’ve not had any leaky spill back pipes after doing this.
I had mine on and off, but I was lucky enough not to have any of these issues with my spill lines. My cover was actually warped a bit as well, rubbed against the lines.Are you guys running the black rubber insulated engine cover thing? I've had to trim mine back quite a bit. I wonder if the lines get messed up when that thing gets pulled off.