I have seen them with holes cut into them and no melting. However, what is the point of having the bed liner if you have holes in them? do you have a tool box to help hid the lower end of the pipe or are you just running them straight up (no kind of "protection box")?
"Late" 99 F250
Crew Cab, Short Box
Straight piped (no muffler but rest of exhaust stock), 35" BFG A/T
DIY NAPA 6637 Intake
Zoodad mod (my version of it)
NOW NEED WW b/c TW is giving me turbo surge Future needs:
Exhaust System with Down Pipe and muffler (to help pass PA inspection)