That in Nebraska it is illegal to only have a catalytic converter on your truck and not a muffler. I went down to were i use to live and i drove my friends 95 ford that have a cat on it that was put in by the pros and Dawson tires and they said that it was perfectly legal to have just the cats on and not have a muffler on at the same time. Well we swithced trucks with my friends G/F and she got pulled over. The people up at the lake turned us in. But what i dont get is other people have louder trucks than his, Some just run headers but they dont get pulled over. I use to drive my truck around town and it had headers on it and it was twice as loud as that truck and never got pulled over. But is it the same in other states? Do you have to have a catalytic converter AND a muffler on at the same time?