I guess that is why you don't live on the west side of the state as they smog check cars for things like Cats and other stupid stuff before you can get your car/truck license renewed.and the other good thing is when you pop the hood or look under your truck you wont have a cute lil fury thing under there my 99 didnt come with one as far as I know it never had one off of show room floor.. I have pulled the cat out of everything I own gas or diesel..