the bulb is in straight, and i cant see anything on the pipe. i wasnt even working with anything that would "spill" on the pipe. im still thinking it has to be from the sliders. the t-rex kit comes with a bar that goes between the headers and the radiator and it has a rubber sleeve on it to protect the radiator in case it hits it. its not touching anything, but im thinking maybe the heat from the headers is slowly melting it.