sorry I did explain that more. the stigner is fine and plenty of room is there for that to move but the lexan body is touching the whole pipe. FE. if you take the pipe and cover the outside with your hand that part is touching the lexan body.
On my cars the pipe might touch the body in a spot or two and it's never been melted but the paint can wear off if you don't put some tape between it. The pipe only gets up to like 150*, woudln't worry about it.