i did mine myself and it took about an hour. I just used my die grinder and cut slots in the old pipe and used a hammer and squew driver. I got my pipe for 25 bucks and though i paid alot sense my brother got his for 15 bucks. Mine had the cat and i took it out. I dought a cop is doing to know if my diesel had a cat on it or not sense they all dont have them. If you got time and want to get dirty do it your self if not have a shop do it, its cheap both ways!