I have noticed a large amount of 'hair' material coming out the back of my exhaust pipe. Thinking I was the subject of a strange practical joke I just pulled a couple of lumps out and thought no more of it.. But it keeps reappearing. Does anyone know what is going on? Has my catalytic converter exploded and sending its furry guts outwards??? (Does it even have fur, hair, whatever it is inside?) Baffled.